2-aminopurine analogs having HSP90-inhibiting activity

ABSTRACT

2-Aminopurine analogs are described and demonstrated or predicted to have utility as Heat Shock Protein 90 (HSP90) inhibiting agents in the treatment and prevention of various HSP90 mediated disorders, e.g., proliferative disorders. Method of synthesis and use of such compounds are also described and claimed.

RELATED APPLICATIONS

This application relates and claims priority to U.S. Provisional Application Ser. No. 60/504,135, filed Sep. 18, 2003, and U.S. Provisional Application Ser. No., 60/591,467, filed Jul. 26, 2004. This application also relates to three other U.S. Utility applications Ser. No. 10/946,637 filed Sep. 20, 2004 (now Publication No. 20050119282), Ser. No. 10/945,851, filed Sep. 20, 2004 (now Publication No. 20050107343) and Ser. No. 10/946,628 filed Sep. 20, 2004 (now Publication No. 20050113339). This application further relates to International Application PCT/US02/35069, filed Oct. 30, 2002 (now Publication No. WO03/37860). All the above cited U.S. utility applications, provisional applications and international application are expressly incorporated herein by reference in their entirety.

FIELD OF THE INVENTION

The invention relates in general to 2-aminopurine analogs and their broad-spectrum utility, e.g., in inhibiting heat shock protein 90 (HSP90) to thereby treat or prevent HSP90-mediated diseases.

BACKGROUND

HSP90s are ubiquitous chaperone proteins that are involved in folding, activation and assembly of a wide range of proteins, including key proteins involved in signal transduction, cell cycle control and transcriptional regulation. Researchers have reported that HSP90 chaperone proteins are associated with important signaling proteins, such as steroid hormone receptors and protein kinases, including, e.g., Raf-1, EGFR, v-Src family kinases, Cdk4, and ErbB-2 (Buchner J. TIBS 1999, 24, 136–141; Stepanova, L. et al. Genes Dev. 1996, 10, 1491–502; Dai, K. et al. J. Biol. Chem. 1996, 271, 22030–4). Studies further indicate that certain co-chaperones, e.g., HSP70, p60/Hop/Sti1, Hip, Bag1, HSP40/Hdj2/Hsj1, immunophilins, p23, and p50, may assist HSP90 in its function (see, e.g., Caplan, A. Trends in Cell Biol. 1999, 9, 262–68).

Ansamycin antibiotics, e.g., herbimycin A (HA), geldanamycin (GM), and 17-allylaminogeldanamycin (17-AAG) are thought to exert their anticancerous effects by tight binding of the N-terminus pocket of HSP90, thereby destabilizing substrates that normally interact with HSP90 (Stebbins, C. et al. Cell 1997, 89, 239–250). This pocket is highly conserved and has weak homology to the ATP-binding site of DNA gyrase (Stebbins, C. et al., supra; Grenert, J. P. et al. J. Biol. Chem. 1997, 272, 23843–50). Further, ATP and ADP have both been shown to bind this pocket with low affinity and to have weak ATPase activity (Proromou, C. et al. Cell 1997, 90, 65–75; Panaretou, B. et al. EMBO J. 1998, 17, 4829–36). In vitro and in vivo studies have demonstrated that occupancy of this N-terminal pocket by ansamycins and other HSP90 inhibitors alters HSP90 function and inhibits protein folding. At high concentrations, ansamycins and other HSP90 inhibitors have been shown to prevent binding of protein substrates to HSP90 (Scheibel, T. H. et al. Proc. Natl. Acad. Sci. USA 1999, 96, 1297–302; Schulte, T. W et al. J. Biol. Chem. 1995, 270, 24585–8; Whitesell, L., et al. Proc. Natl. Acad. Sci. USA 1994, 91, 8324–8328). Ansamycins have also been demonstrated to inhibit the ATP-dependent release of chaperone-associated protein substrates (Schneider, C. L. et al. Proc. Natl. Acad. Sci., USA 1996, 93, 14536–41; Sepp-Lorenzino et al. J. Biol. Chem. 1995, 270, 16580–16587). In either event, the substrates are degraded by a ubiquitin-dependent process in the proteasome (Schneider, C. L., supra; Sepp-Lorenzino, L., et al. J. Biol. Chem. 1995, 270, 16580–16587; Whitesell, L. et al. Proc. Natl. Acad. Sci. USA 1994, 91, 8324–8328).

HSP90 substrate destabilization occurs in tumor and non-transformed cells alike and has been shown to be especially effective on a subset of signaling regulators, e.g., Raf (Schulte, T. W. et al. Biochem. Biophys. Res. Commun. 1997, 239, 655–9; Schulte, T. W., et al. J. Biol. Chem. 1995, 270, 24585–8), nuclear steroid receptors (Segnitz, B.; U. Gehring J. Biol. Chem. 1997, 272, 18694–18701; Smith, D. F. et al. Mol. Cell. Biol. 1995, 15, 6804–12), v-Src (Whitesell, L., et al. Proc. Natl. Acad. Sci. USA 1994, 91, 8324–8328) and certain transmembrane tyrosine kinases (Sepp-Lorenzino, L. et al. J. Biol. Chem. 1995, 270, 16580–16587) such as EGF receptor (EGFR) and HER2/Neu (Hartmann, F., et al. Int. J. Cancer 1997, 70, 221–9; Miller, P. et al. Cancer Res. 1994, 54, 2724–2730; Mimnaugh, E. G., et al. J. Biol. Chem. 1996, 271, 22796–801; Schnur, R. et al. J. Med. Chem. 1995, 38, 3806–3812), CDK4, and mutant p53. Erlichman et al. Proc. AACR 2001, 42, abstract 4474. The ansamycin-induced loss of these proteins leads to the selective disruption of certain regulatory pathways and results in growth arrest at specific phases of the cell cycle (Muise-Heimericks, R. C. et al. J. Biol. Chem. 1998, 273, 29864–72), and apoptosis, and/or differentiation of cells so treated (Vasilevskaya, A. et al. Cancer Res., 1999, 59, 3935–40). Ansamycins thus hold great promise for the treatment and/or prevention of many types of cancers and proliferative disorders, and also hold promise as traditional antibiotics. However, their relative insolubility makes them difficult to formulate and administer, and they are not easily synthesized and currently must, at least in part, be generated through fermentation. Further, the dose limiting toxicity of ansamycins is hepatic.

In addition to anti-cancer and antitumorgenic activity, HSP90 inhibitors have also been implicated in a wide variety of other utilities, including use as anti-inflammation agents, anti-infectious disease agents, agents for treating autoimmunity, agents for treating stroke, ischemia, multiple sclerosis, cardiac disorders, central nervous system related disorders and agents useful in promoting nerve regeneration (See, e.g., Rosen et al. WO 02/09696 (PCT/US01/23640); Degranco et al. WO 99/51223 (PCT/US99/07242); Gold, U.S. Pat. No. 6,210,974 B1; DeFranco et al., U.S. Pat. No. 6,174,875. Overlapping somewhat with the above, there are reports in the literature that fibrogenetic disorders including but not limited to scleroderma, polymyositis, systemic lupus, rheumatoid arthritis, liver cirrhosis, keloid formation, interstitial nephritis, and pulmonary fibrosis also may be treatable with HSP90 inhibitors. Strehlow, WO 02/02123 (PCT/US01/20578). Still further HSP90 modulation, modulators and uses thereof are reported in Application Nos. PCT/US03/04283, PCT/US02/35938, PCT/US02/16287, PCT/US02/06518, PCT/US98/09805, PCT/US00/09512, PCT/US01/09512, PCT/US01/23640, PCT/US01/46303, PCT/US01/46304, PCT/US02/06518, PCT/US02/29715, PCT/US02/35069, PCT/US02/35938, PCT/US02/39993, 60/293,246, 60/371,668, 60/335,391, 60/128,593, 60/337,919, 60/340,762, 60/359,484 and 60/331,893.

Recently, purine derivatives showing HSP90 inhibitory activity have been reported, e.g., in PCT/US02/35069; PCT/US02/36075. Purine moieties are well accepted bioisosteres for a variety of ATP-dependent molecular targets, see, JP 10025294; U.S. Pat. No. 4,748,177; U.S. Pat. No. 4,772,606; U.S. Pat. No. 6,369,092; WO 00/06573; WO 02/055521; WO 02/055082; WO 02/055083; European Patent 0178178; Eur. J. Med. Chem. 1994, 29(1), 3–9; and J. Het. Chem. 1990, 27(5), 1409. However, compounds having the desired potency, selectivity and pharmaceutical properties required for effective HSP90 inhibition in vivo have not been reported. Therefore, a need remains for additional novel and potent HSP90 inhibitors that meet the demanding biological and pharmaceutical criteria required to proceed towards human clinical trials.

SUMMARY OF THE INVENTION

The present invention is directed towards heterocyclic compounds, in particular towards 2-aminopures and related compounds that show broad utility, e.g., in inhibiting HSP90 and/or treating and preventing diseases that are HSP90-dependent.

In one aspect, the invention comprises the heterocyclic compounds as specified below in Formulae A and I, and compounds that are produced by a process of the invention. Also included in the scope of the present invention are stereoisomeric forms, including the individual enantiomers and diastereomers, racemic mixtures, and diastereomeric mixtures, as well as polymorphs, solvates, esters, tautomers, pharmaceutically acceptable salts and prodrugs of these compounds. Stereoisomers of the compounds of the present invention may be isolated by standard resolution techniques such as, for example, fractional crystallization and chiral column chromatography.

In one embodiment, the invention provides compounds of Formula A, or a polymorph, solvate, ester, tautomer, diastereomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, which show utility by inhibiting HSP90 and treating and/or preventing diseases that are HSP90-dependent.

wherein:

X¹ and X² are the same or different and each is nitrogen or —CR⁶;

X³ is nitrogen or —CR³ wherein R³ is hydrogen, OH, a keto tautomer, —OR⁸, —CN, halogen, lower alkyl, or —C(O)R⁹;

X⁴ is nitrogen or —CR⁶ when X³ is nitrogen, and X⁴ is —CR⁶R⁷ when X³ is —CR³;

R¹ is halogen, —OR⁸, —SR⁸, or lower alkyl;

R² is —NR⁸R¹⁰;

R⁴ is —(CH₂)_(n)— wherein n=0–3, —C(O), —C(S), —SO₂—, or —SO₂N—; and

R⁵ is alkyl, aromatic, heteroaromatic, alicyclic, or heterocyclic, each of which is optionally bi-or tri-cyclic, and optionally substituted with H, halogen, lower alkyl, lower alkenyl, lower alkynyl, lower aryl, lower alicyclic, aralkyl, aryloxyalkyl, alkoxyalkyl, perhaloalkyl, perhaloalkyloxy, perhaloacyl, —N₃, —SR⁸, —OR⁸, —CN, —CO₂R⁹, —NO₂, or —NR⁸R¹⁰.

In certain embodiments, there are exclusionary provisos with respect to compounds disclosed in JP 10025294; U.S. Pat. No. 4,748,177; U.S. Pat. No. 4,748,177; U.S. Pat. No. 6,369,092; WO 00/06573; WO 02/055521; WO 02/055082; WO 02/055083; Eur. J. Med. Chem. 1994, 29(1), 3–9; and J. Het. Chem. 1990, 27(5), 1409, which disclose compounds with —R⁴R⁵ comprising ribose or a derivative thereof, or a sugar or derivative thereof; compounds where —R⁴R⁵ is a phosphonate or phosphonic acid, or is substituted with a phosphonate or phosphonic acid; or compounds where R⁴ is —CH₂— or —(CH₂)_(n)— that are connected through an oxygen atom to another group.

In another embodiment, the invention provides compounds of Formula I, or a polymorph, solvate, ester, tautomer, enantiomer, diastereomer, pharmaceutically acceptable salt or prodrug thereof, which show utility for inhibiting HSP90 and for treating and/or preventing diseases that are HSP90-dependent,

wherein:

-   -   R¹ is halogen or lower alkyl;     -   R² is —NR⁸R¹⁰;     -   R⁴ is —CHR¹²—;     -   R³ is hydrogen, halogen, or —CN;     -   R⁵ is aryl, heteroaryl, alicyclic, or heterocyclic, wherein         -   the aryl group is substituted with 3 to 5 substituents,         -   the heteroaryl group is substituted with 2 to 5             substituents, wherein when the heteroaryl is substituted             with only two substituents, the two substituents must form             part of an optionally substituted fused ring,         -   the alicyclic group is substituted with 3 to 5 substituents,         -   the heterocyclic group is substituted with 3 to 5             substituents, and         -   the substituents are selected from the group of halogen,             lower alkyl, lower alkenyl, lower alkynyl, lower aryl, lower             alicyclic, arylalkyl, aryloxy, aryloxyalkyl, alkoxyalkyl,             perhaloalkyl, perhaloalkyloxy, perhaloacyl, —N₃, —SR⁸, —OR⁸,             —CN, —C(O)R⁹, —NO₂, —NR⁸R¹⁰, phosphonate and phosphonic             acid;     -   R⁸ is hydrogen, lower alkyl, lower aryl, or —C(O)R⁹;     -   R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR¹⁰R¹⁰ or         —OR¹¹;     -   R¹⁰ is independently hydrogen or lower alkyl;     -   R¹¹ is lower alkyl, lower aryl or lower heteroaryl;     -   R¹² is hydrogen or lower alkyl;         provided that     -   when R⁵ is aryl, R⁵ is not an organo-metallic cyclopentadiene;     -   when R⁵ is phenyl, the substituents are not 3,5 di-halo;     -   when R⁵ is alicyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons; and     -   when R⁵ is heterocyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons or the ring system is not a         tetra-substituted pyrrolidine.

In another embodiment, the invention provides compounds, or a polymorph, solvate, ester, tautomer, diastereomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, which show utility for inhibiting HSP90 and treating and/or preventing diseases that are HSP90-dependent, that are prepared by the process comprising:

-   -   reacting a compound of Formula Y and a compound of Formula Z,         wherein:     -   Y is represented by any of the following formulae:

-   -   Z is L¹-R⁴—R⁵; wherein:         -   L¹ is halogen, NR⁸R¹⁰, triflate, tosylate, or mesylate;         -   R⁴ is —CHR¹²—,         -   R⁵ is aryl, heteroaryl, alicyclic, or heterocyclic, wherein:         -   the aryl group is substituted with 3 to 5 substituents,         -   the heteroaryl group is substituted with 2 to 5             substituents; wherein when the heteroaryl is substituted             with only two substituents, the two substituents must form             part of an optionally substituted fused ring,         -   the alicyclic group is substituted with 3 to 5 substituents,         -   the heterocyclic group is substituted with 3 to 5             substituents, and         -   the substituents are selected from the group of halogen,             lower alkyl, lower alkenyl, lower alkynyl, lower aryl, lower             alicyclic, arylalkyl, aryloxy, aryloxyalkyl, alkoxyalkyl,             perhaloalkyl, perhaloalkyloxy, perhaloacyl, —N₃, —SR⁸, —OR⁸,             —CN, —C(O)R⁹, —NO₂, —NR⁸R¹⁰, phosphonate and phosphonic             acid;         -   R⁸ is hydrogen, lower alkyl, lower aryl, or —C(O)R⁹;         -   R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR¹⁰R¹⁰ or             —OR¹¹;         -   R¹⁰ is independently hydrogen or lower alkyl;         -   R¹¹ is lower alkyl, lower aryl or lower heteroaryl;         -   R¹² is hydrogen or lower alkyl;         -   R²¹ is halogen, lower alkyl or —OH;         -   R²² is —NR⁸R¹⁰;         -   R²³ is hydrogen, halogen, or —CN;         -   R²⁴ is —NH₂, —NO₂ or —NO;         -   R²⁵ is halogen or —OH;         -   R²⁶ is —C(O)NH₂ or C(O)OEt; and         -   R²⁷ is —NH₂, —OH or halogen;             provided that:     -   when R⁵ is aryl, R⁵ is not an organo-metallic cyclopentadiene;     -   when R⁵ is phenyl, the substituents are not 3,5 di-halo;     -   when R⁵ is alicyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons; or     -   when R⁵ is heterocyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons or the ring system is not a         tetra-substituted pyrrolidine.

Another aspect of the invention is a method of treating an individual having an HSP90 mediated disorder comprising administering to said individual a pharmaceutical composition comprising a pharmaceutically effective amount of a compound of Formula I:

or a polymorph, solvate, ester, tautomer, enantiomer, diastereomer, pharmaceutically acceptable salt or prodrug thereof, wherein:

-   -   R¹ is halogen, —OR¹¹, —SR¹¹, —NHR⁸, hydrogen, or lower alkyl;     -   R² is —NR⁸R¹⁰;     -   R³ is hydrogen, halogen, —N₃, or —CN;     -   R⁴ is —(CHR¹²)_(n)— where n=0, 1 or 2, —C(O)—, —C(S)—, or         —S(O)—;     -   R⁵ is alkyl, aryl, heteroaryl, alicyclic, or heterocyclic, all         optionally substituted with halogen, lower alkyl, lower alkenyl,         lower alkynyl, lower aryl, lower alicyclic, arylalkyl, aryloxy,         aryloxyalkyl, alkoxyalkyl, perhaloalkyl, perhaloalkyloxy,         perhaloacyl, —N₃, —SR⁸, —OR⁸, —CN, —C(O)R⁹, —NO₂, or —NR⁸R¹⁰;     -   R⁸ is hydrogen, lower alkyl, lower aryl, or —C(O)R⁹;     -   R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR¹⁰R¹⁰, or         —OR¹¹;     -   R¹⁰ is independently hydrogen or lower alkyl;     -   R¹¹ is lower alkyl, lower aryl or lower heteroaryl;     -   R¹² is hydrogen or lower alkyl;         provided that:     -   —R⁴R⁵ is not a ribose or derivative thereof, or a sugar or         derivative thereof;     -   —R⁴R⁵ is not a phosphonate or phosphonic acid, or substituted         with phosphonate or phosphonic acid; and     -   when R⁴ is —(CH₂)_(n)— where n=1 or 2, then R⁴ and R⁵ are not         connected through an ether linkage.

In one embodiment, the invention provides a method for treating an individual having a disorder selected from the group of inflammatory diseases, infections, autoimmune disorders, stroke, ischemia, cardiac disorders, neurological disorders, fibrogenetic disorders, proliferative disorders, tumors, leukemias, neoplasms, cancers, carcinomas, metabolic diseases, and malignant disease.

In another embodiment, the invention provides a method for treating an individual having a fibrogenetic disorder, such as, for example, scleroderma, polymyositis, systemic lupus, rheumatoid arthritis, liver cirrhosis, keloid formation, interstitial nephritis and pulmonary fibrosis.

In another embodiment, the invention provides a combination therapy comprising the administration of a pharmaceutically effective amount of a compound of Formulae A, I or II, or a solvate, tautomer, pharmaceutically acceptable salt, polymorph, or prodrug thereof according to any of the preceding aspects or embodiments, and at least one therapeutic agent selected from the group of cytotoxic agents, anti-angiogenesis agents and anti-neoplastic agents. The anti-neoplastic agent may be selected from the group of alkylating agents, anti-metabolites, epidophyllotoxins antineoplastic enzymes, topoisomerase inhibitors, procarbazines, mitoxantrones, platinum coordination complexes, biological response modifiers and growth inhibitors, hormonal/anti-hormonal therapeutic agents, and haematopoietic growth factors.

In another aspect, the present invention is directed to pharmaceutical compositions comprising the compounds of the-invention, in particular, the compounds of Formulae A, I and II, and compounds formed by the process of the invention, and their polymorphs, solvates, esters, tautomers, diastereomer, enantiomers, pharmaceutically acceptable salts and prodrugs thereof, and one or more pharmaceutical excipients, for use in treatment or prevention of diseases that are HSP90-dependent.

Any of the above described aspects and embodiments of the invention can be combined where practical.

The individual compounds, methods and compositions prescribed do not preclude the utilization of other, unspecified steps and agents, and those of ordinary skill in the art will appreciate that additional steps and compounds may also be combined usefully within the spirit of various aspects and embodiments of the invention.

Advantages of the invention depend on the specific aspect and embodiment and may include one or more of: ease of synthesis and/or formulation, solubility, and IC₅₀ relative to previously existing compounds in the same or different classes of HSP90 inhibitors.

DETAILED DESCRIPTION OF THE INVENTION I. Definitions

A “pharmaceutically acceptable derivative or prodrug” means any pharmaceutically acceptable salt, ester, salt of an ester or other derivative of a compound of this invention, which, upon administration to a recipient, is capable of providing, either directly or indirectly, a compound of this invention or a pharmaceutically active metabolite or residue thereof. Particularly favored derivatives or prodrugs are those that increase the bioavailability of the compounds of this invention when such compounds are administered to a patient (e.g., by allowing orally administered compound to be more readily absorbed into blood) or which enhance delivery of the parent compound to a biological compartment (e.g., the brain or lymphatic system).

A “pharmaceutically acceptable salt” may be prepared for any compound of the invention having a functionality capable of forming a salt, for example, an acid or base functionality. Pharmaceutically acceptable salts may be derived from organic or inorganic acids and bases. Compounds of the invention that contain one or more basic functional groups, e.g., amino or alkylamino, are capable of forming pharmaceutically acceptable salts with pharmaceutically acceptable organic and inorganic acids. These salts can be prepared in situ during the final isolation and purification of the compounds of the invention, or by separately reacting a purified compound of the invention in its free base form with a suitable organic or inorganic acid, and isolating the salt thus formed. Examples of suitable acid salts include acetate, adipate, alginate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, citrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptanoate, glycerophosphate, glycolate, hemisulfate, heptanoate, hexanoate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxyethanesulfonate, lactate, maleate, malonate, methanesulfonate, 2-napthalenesulfonate, nicotinate, nitrate, oxalate; palmoate, pectinate, persulfate, 3-phenylpropionate, phosphate, picrate, pivalate, propionate, salicylate, succinate, sulfate, tartrate, thiocyanate, tosylate and undeconate. Other acids, such as oxalic, while not in themselves pharmaceutically acceptable, may be employed in the preparation of salts useful as intermediates in obtaining the compounds of the invention and their pharmaceutically acceptable acid addition salts. See, e.g., Berge et al. “Pharmaceutical Salts”, J. Pharm. Sci. 1977, 66:1–19.

Compounds of the present invention that contain one or more acidic functional groups are capable of forming pharmaceutically acceptable salts with pharmaceutically acceptable bases. The term “pharmaceutically acceptable salts” in these instances refers to the relatively non-toxic, inorganic and organic base addition salts of compounds of the present invention. These salts can Iikewise be prepared in situ during the final isolation and purification of the compounds, or by separately reacting the purified compound in its free acid form with a suitable base, such as the hydroxide, carbonate or bicarbonate of a pharmaceutically acceptable metal cation, with ammonia, or with a pharmaceutically acceptable organic primary, secondary or tertiary amine. Representative alkali or alkaline earth salts include the lithium, sodium, potassium, calcium, magnesium, and aluminum salts and the like. Illustrative examples of some of the bases that can be used include sodium hydroxide, potassium hydroxide, choline hydroxide, sodium carbonate, N⁺(C₁₋₄ alkyl)₄, and the like. Representative organic amines useful for the formation of base addition salts include ethylamine, diethylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine and the like. This invention also envisions the quaternization of any basic nitrogen-containing groups of the compounds disclosed herein. Water or oil-soluble or dispersible products may be obtained by such quaternization. See, for example, Berge et al., supra.

Pharmaceutically acceptable prodrugs of the compounds of this invention include, but are not limited to, esters, carbonates, thiocarbonates, N-acyl derivatives, N-acyloxyalkyl derivatives, quaternary derivatives of tertiary amines, N-Mannich bases, Schiff bases, aminoacid conjugates, phosphate esters, metal salts and sulfonate esters.

Suitable positions for derivatization of the compounds of the invention to create “prodrugs” include but are not limited, 2-amino substitution. Those of ordinary skill in the art have the knowledge and means to accomplish this without undue experimentation. Various forms of prodrugs are well known in the art. For examples of such prodrug-derivatives, see, e.g.,

a) Design of Prodrugs, Bundgaard, A. Ed., Elseview, 1985 and Method in Enzymology, Widder, K. et al., Ed.; Academic, 1985, vol. 42, p. 309–396;

b) Bundgaard, H. “Design and Application of Prodrugs” in A Textbook of Drug Design and Development, Krosgaard-Larsen and H. Bundgaard, Ed., 1991, Chapter 5, p. 113–191; and

c) Bundgaard, H., Advanced Drug Delivery Review, 1992, 8, 1–38.

Each of which is incorporated herein by reference.

The term “prodrugs” as employed herein includes, but is not limited to, the following groups and combinations of these groups:

Hydroxy Prodrugs:

-   -   Acyloxyalkyl esters;     -   Alcoxycarbonyloxyalkyl esters;     -   Alkyl esters;     -   Aryl esters;     -   Disulfide containing esters.

Amine Prodrugs:

The term “alkyl,” alone or in combination, refers to an optionally substituted straight-chain, or optionally substituted branched-chain saturated hydrocarbon radical having from one to about thirty carbons, more preferably one to twelve carbons. Examples of alkyl radicals include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, tert-amyl, pentyl, hexyl, heptyl, octyl and the like. The term “cycloalkyl” embraces cyclic alkyl radicals which include monocyclic, bicyclic, tricyclic, and higher multicyclic alkyl radicals wherein each cyclic moiety has from three to eight carbon atoms. Examples of cycloalkyl radicals include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and the like. A “lower alkyl” is a shorter alkyl, e.g., one containing from one to six carbon atoms.

The term “alkenyl,” alone or in combination, refers to an optionally substituted straight-chain, or optionally substituted branched-chain hydrocarbon radical having one or more carbon-carbon double-bonds and having from two to thirty carbon atoms, more preferably two to eighteen carbons. Examples of alkenyl radicals include ethenyl, propenyl, butenyl, 1,3-butadienyl and the like. The term “cycloalkenyl” refers to cyclic alkenyl radicals which include monocyclic, bicyclic, tricyclic, and higher multicyclic alkenyl radicals wherein each cyclic moiety has from three to eight carbon atoms. A “lower alkenyl” refers to an alkenyl having from two to six carbons.

The term “alkynyl,” alone or in combination, refers to an optionally substituted straight-chain or optionally substituted branched-chain hydrocarbon radical having one or more carbon-carbon triple-bonds and having from two to thirty carbon atoms, more preferably from two to twelve carbon atoms, from two to six carbon atoms as well as those having from two to four carbon atoms. Examples of alkynyl radicals include ethynyl, 2-propynyl, 2-butynyl, 1,3-butadiynyl and the like. The term “cycloalkynyl” refers to cyclic alkynyl radicals which include monocyclic, bicyclic, tricyclic, and higher multicyclic alkynyl radicals wherein each cyclic moiety has from three to eight carbon atoms. A “lower alkynyl” refers to an alkynyl having from two to six carbons.

The terms “heteroalkyl, heteroalkenyl and heteroalkynyl” include optionally substituted alkyl, alkenyl and alkynyl structures, as described above, and which have one or more skeletal chain atoms selected from an atom other than carbon, e.g., oxygen, nitrogen, sulfur, phosphorous or combinations thereof.

The term “carbon chain” embraces any alkyl, alkenyl, alkynyl, or heteroalkyl, heteroalkenyl, or heteroalkynyl group, which are linear, cyclic, or any combination thereof. If the chain is part of a linker and that linker comprises one or more rings as part of the core backbone, for purposes of calculating chain length, the “chain” only includes those carbon atoms that compose the bottom or top of a given ring and not both, and where the top and bottom of the ring(s) are not equivalent in length, the shorter distance shall be used in determining the chain length. If the chain contains heteroatoms as part of the backbone, those atoms are not calculated as part of the carbon chain length.

The term “membered ring” can embrace any cyclic structure, including aromatic, heteroaromatic, alicyclic, heterocyclic and polycyclic fused ring systems as described below. The term “membered” is meant to denote the number of skeletal atoms that constitute the ring. Thus, for example, pyridine, pyran, and pyrimidine are six-membered rings and pyrrole, tetrahydrofuran, and thiophene are five-membered rings.

The term “aryl,” alone or in combination, refers to an optionally substituted aromatic hydrocarbon radical of six to twenty ring atoms, and includes mono-aromatic rings and fused aromatic ring. A fused aromatic ring radical contains from two to four fused rings where the ring of attachment is an aromatic ring, and the other individual rings within the fused ring may be aromatic, heteroaromatic, alicyclic or heterocyclic. Further, the term aryl includes mono-aromatic ring and fused aromatic rings containing from six to twelve carbon atoms, as well as those containing from six to ten carbon atoms. Examples of aryl groups include, without limitation, phenyl, naphthyl, anthryl, chrysenyl, and benzopyrenyl ring systems. The term “lower aryl” refers to an aryl having six to ten skeletal ring carbons, e.g., phenyl and naphthyl ring systems.

The term “heteroaryl” refers to optionally substituted aromatic radicals containing from five to twenty skeletal ring atoms and where one or more of the ring atoms is a heteroatom such as, for example, oxygen, nitrogen, sulfur, selenium and phosphorus. The term heteroaryl includes optionally substituted mono-heteroaryl radicals and fused heteroaryl radicals having at least one heteroatom (e.g., quinoline, benzothiazole). A fused heteroaryl radical may contain from two to four fused rings and where the ring of attachment is a heteroaromatic ring, the other individual rings within the fused ring system may be aromatic, heteroaromatic, alicyclic or heterocyclic. The term heteroaryl also includes mono-heteroaryls or fused heteroaryls having from five to twelve skeletal ring atoms, as well as those having from five to ten skeletal ring atoms. Examples of heteroaryls include, without limitation, furanyl, benzofuranyl, chromenyl, pyridyl, pyrrolyl, indolyl, quinolinyl, pyridyl-N-oxide, pyrimidyl, pyrazinyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, benzothiozole, benzimidazole, benzoxazoles, benzothiadiazole, benzoxadiazole, benzotriazole, quinolines, isoquinolines, indoles, purinyl, indolizinyl, thienyl and the like and their oxides. The term “lower heteroaryl” refers to a heteroaryl having five to ten skeletal ring atoms, e.g., pyridyl, thienyl, pyrimidyl, pyrazinyl, pyrrolyl, or furanyl.

The term “alicyclic” alone or in combination, refers to an optionally substituted saturated or unsaturated nonaromatic hydrocarbon ring system containing from three to twenty ring atoms. The term alicyclic includes mono-alicyclic and fused alicyclic radicals. A fused alicyclic may contain from two to four fused rings where the ring of attachment is an alicyclic ring, and the other individual rings within the fused-alicyclic radical may be aromatic, heteroaromatic, alicyclic and heterocyclic. The term alicyclic also includes mono-alicyclic and fused alicyclic radicals containing from three to twelve carbon atoms, as well as those containing from three to ten carbon atoms. Examples of alicyclics include, without limitation, cyclopropyl, cyclopropenyl, cyclobutyl, cyclopentyl, cyclodecyl, cyclododecyl, cyclopentadienyl, indanyl, and cyclooctatetraenyl ring systems. The term “lower alicyclic” refers to an alicyclic having three to ten skeletal ring carbons, e.g., cyclopropyl, cyclopropenyl, cyclobutyl, cyclopentyl, decalinyl, and cyclohexyl.

The term “heterocyclic” refers to optionally substituted saturated or unsaturated nonaromatic ring radicals containing from five to twenty ring atoms where one or more of the ring atoms are heteroatoms such as, for example, oxygen, mtrogen, sulfur, and phosphorus. The term alicyclic includes mono-heterocyclic and fused heterocyclic ring radicals. A fused heterocyclic radical may contain from two to four fused rings where the attaching ring is a heterocyclic, and the other individual rings within the fused heterocyclic radical may be aromatic, heteroaromatic, alicyclic or heterocyclic. The term heterocyclic also includes mono-heterocyclic and fused alicyclic radicals having from five to twelve skeletal ring atoms, as well as those having from five to ten skeletal ring atoms. Example of heterocyclics include without limitation, tetrahydrofuranyl, benzodiazepinyl, tetrahydroindazolyl, dihyroquinolinyl, and the like. The term “lower heterocyclic” refers to a heterocyclic ring system having five to ten skeletal ring atoms, e.g., dihydropyranyl, pyrrolidinyl, indolyl, piperidinyl, piperazinyl, and the like.

The term “alkylaryl,” alone or in combination, refers to an aryl radical as defined above in which one H atom is replaced by an alkyl radical as defined above, such as, for example, tolyl, xylyl and the like.

The term “arylalkyl,” or “araalkyl,” alone or in combination, refers to an alkyl radical as defined above in which one H atom is replaced by an aryl radical as defined above, such as, for example, benzyl, 2-phenylethyl and the like.

The term “heteroarylalkyl” refers to an alkyl radical as defined above in which one H atom is replaced by a heteroaryl radical as defined above, each of which may be optionally substituted.

The term “alkoxy,” alone or in combination, refers to an alkyl ether radical, alkyl-O—, wherein the term alkyl is defined as above. Examples of alkoxy radicals include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, iso-butoxy, sec-butoxy, tert-butoxy and the like.

The term “aryloxy,” alone or in combination, refers to an aryl ether radical wherein the term aryl is defined as above. Examples of aryloxy radicals include phenoxy, benzyloxy and the like.

The term “alkylthio,” alone or in combination, refers to an alkyl thio radical, alkyl-S—, wherein the term alkyl is as defined above.

The term “arylthio,” alone or in combination, refers to an aryl thio radical, aryl-S—, wherein the term aryl is as defined above.

The term “heteroarylthio” refers to the group heteroaryl-S—, wherein the term heteroaryl is as defined above.

The term “acyl” refers to a radical —C(O)R where R includes alkyl, alkenyl, alkynyl, aryl, heteroaryl, alicyclic, heterocyclic, arylalkyl or heteroarylalkyl wherein the alkyl, alkenyl, alkynyl, aryl, heteroaryl, alicyclic, heterocyclic, arylalkyl or heteroaryl alkyl groups may be optionally substituted.

The term “acyloxy” refers to the ester group —OC(O)R, where R is H, alkyl, alkenyl, alkynyl, aryl, heteroaryl, alicyclic, heterocyclic, arylalkyl, or heteroarylalkyl wherein the alkyl, alkenyl, alkynyl, aryl, heteroaryl, alicyclic, heterocyclic, arylalkyl or heteroarylalkyl may be optionally substituted.

The term “carboxy esters” refers to —C(O)OR where R is alkyl, aryl or arylalkyl, wherein the alkyl, aryl and arylalkyl groups may be optionally substituted.

The term “carboxamido” refers to

where each of R and R′ are independently selected from the group consisting of H, alkyl, aryl, heteroaryl, alicyclic, heterocyclic, arylalkyl and heteroarylalkyl, wherein the alkyl, aryl, heteroaryl, alicyclic, heterocyclic, or arylalkyl groups may be optionally substituted.

The term “oxo” refers to ═O.

The term “halogen” includes F, Cl, Br and I.

The terms “haloalkyl, haloalkenyl, haloalkynyl and haloalkoxy” include alkyl, alkenyl, alkynyl and alkoxy structures, as described above, that are substituted with one or more fluorines, chlorines, bromines or iodines, or with combinations thereof.

The terms “perhaloalkyl, perhaloalkyloxy and perhaloacyl” refer to alkyl, alkyloxy and acyl radicals as described above, that all the H atoms are substituted with fluorines, chlorines, bromines or iodines, or combinations thereof.

The terms “cycloalkyl, arylalkyl, aryl, heteroaryl, alicyclic, heterocyclic, alkyl, alkynyl, alkenyl, haloalkyl, and heteroalkyl” include optionally substituted cycloalkyl, arylalkyl, aryl, heteroaryl, alicyclic, heterocyclic, alkyl, alkynyl, alkenyl, haloalkyl and heteroalkyl groups.

The terms “alkylamino”, refers to the group —NHR′ where R is independently selected from alkyl.

The terms “dialkylamino”, refers to the group —NRR′ where R and R′ are alkyls.

The term “sulfide” refers to a sulfur atom covalently linked to two atoms; the formal oxidation state of said sulfur is (II). The term “thioether” may be used interchangeably with the term “sulfide.”

The term “sulfoxide” refers to a sulfur atom covalently linked to three atoms, at least one of which is an oxygen atom; the formal oxidation state of said sulfur atom is (IV).

The term “sulfone” refers to a sulfur atom covalently linked to four atoms, at least two of which are oxygen atoms; the formal oxidation state of said sulfur atom is (VI).

The terms “optional” or “optionally” mean that the subsequently described event or circumstance may but need not occur, and that the description includes instances where the event or circumstance occurs and instances in which it does not. For example, “aryl optionally mono- or di-substituted with an alkyl” means that the alkyl may but need not be present, or either one alkyl or two may be present, and the description includes situations where the aryl is substituted with one or two alkyls and situations where the aryl is not substituted with an alkyl.

“Optionally substituted” groups may be substituted or unsubstituted. The substituents of an “optionally substituted” group may include, without limitation, one or more substituents independently selected from the following groups or designated subsets thereof: lower alkyl, lower alkenyl, lower alkynyl, lower aryl, heteroaryl, alicyclic, heterocyclic, arylalkyl, heteroarylalkyl, lower alkoxy, lower aryloxy, amino, alkylamino, dialkylamino, arylalkylamino, alkylthio, arylthio, heteroarylthio, oxo, carbonyl (—C(O)), carboxyesters (—C(O)OR), carboxamido (—C(O)NH₂), carboxy, acyloxy, —H, halo, —CN, —NO₂, —N₃, —SH, —OH, —C(O)CH₃, perhaloalkyl, perhaloalkoxy, perhaloacyl, guanidinyl, pyridinyl, thiophene, furanyl, indolyl, indazolyl. An optionaaly substituted group may be unsubstituted (e.g., —CHCH₃), fully substituted (e.g., —CF₂CF₃), monosubstituted (e.g., —CH₂CH₂F) or substituted at a level anywhere in-between fully substituted and monosubstituted (e.g., —CH₂CF₃).

The term “pyridine-1-oxy” also means “pyridine-N-oxy.”

Some of the compounds of the present invention may contain one or more chiral centers and therefore may exist in enantiomeric and diastereomeric forms. The scope of the present invention is intended to cover all isomers per se, as well as mixtures of cis and trans isomers, mixtures of diastereomers and racemic mixtures of enantiomers (optical isomers) as well. Further, it is possible using well known techniques to separate the various forms, and some embodiments of the invention may feature purified or enriched species of a given enantiomer or diastereomer.

A “pharmacological composition” refers to a mixture of one or more of the compounds described herein, or pharmaceutically acceptable salts thereof, with other chemical components, such as pharmaceutically acceptable carriers and/or excipients. The purpose of a pharmacological composition is to facilitate administration of a compound to an organism.

The phrase “pharmaceutically acceptable carrier” as used herein means a pharmaceutically-acceptable material, composition or vehicle, such as a liquid or solid filler, diluent, excipient, solvent or encapsulating material, involved in carrying or transporting the subject agent from one organ, or portion of the body, to another organ, or portion of the body. Each carrier must be “acceptable” in the sense of being compatible with the other ingredients of the formulation and not injurious to the patient. Some examples of materials which can serve as pharmaceutically-acceptable carriers include: (1) sugars, such as lactose, glucose and sucrose; (2) starches, such as corn starch and potato starch; (3) cellulose, and its derivatives, such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; (4) powdered tragacanth; (5) malt; (6) gelatin; (7) talc; (8) excipients, such as cocoa butter and suppository waxes; (9) oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; (10) glycols, such as propylene glycol; (11) polyols, such as glycerin, sorbitol, mannitol and polyethylene glycol; (12) esters, such as ethyl oleate and ethyl laurate; (13) agar; (14) buffering agents, such as magnesium hydroxide and aluminum hydroxide; (15) alginic acid; (16) pyrogen-free water; (17) isotonic saline; (18) Ringer's solution; (19) ethyl alcohol; (20) phosphate buffer solutions; and (21) other non-toxic compatible substances employed in pharmaceutical formulations. A physiologically acceptable carrier should not cause significant irritation to an organism and does not abrogate the biological activity and properties of the administered compound.

An “excipient” refers to an inert substance added to a pharmacological composition to further facilitate administration of a compound. Examples of excipients include but are not limited to calcium carbonate, calcium phosphate, various sugars and types of starch, cellulose derivatives, gelatin, vegetable oils and polyethylene glycols.

A “pharmaceutically effective amount” means an amount which is capable of providing a therapeutic and/or prophylactic effect the specific dose of compound administered according to this invention to obtain therapeutic and/or prophylactic effect will, of course, be determined by the particular circumstances surrounding the case, including, for example, the specific compound administered, the route of administration, the condition being treated, and the individual being treated. A typical daily dose (administered in single or divided doses) will contain a dosage level of from about 0.01 mg/kg to about 50–100 mg/kg of body weight of an active compound of the invention. Preferred daily doses generally will be from about 0.05 mg/kg to about 20 mg/kg and ideally from about 0.1 mg/kg to about 10 mg/kg. Factors such as clearance rate, half-life and maximum tolerated dose (MTD) have yet to be determined but one of ordinary skill in the art can determine these using standard procedures.

In some method embodiments, the preferred therapeutic effect is the inhibition, to some extent, of the growth of cells characteristic of a proliferative disorder, e.g., breast cancer. A therapeutic effect will also normally, but need not, relieve to some extent one or more of the symptoms other than cell growth or size of cell mass. A therapeutic effect may include, for example, one or more of 1) a reduction in the number of cells; 2) a reduction in cell size; 3) inhibition (i.e., slowing to some extent, preferably stopping) of cell infiltration into peripheral organs, e.g., in the instance of cancer metastasis; 3) inhibition (i.e., slowing to some extent, preferably stopping) of tumor metastasis; 4) inhibition, to some extent, of cell growth; and/or 5) relieving to some extent one or more of the symptoms associated with the disorder.

As used herein, the term IC₅₀ refers to an amount, concentration or dosage of a particular test compound that achieves a 50% inhibition of a maximal response in an assay that measures such response. In some method embodiments of the invention, the “IC₅₀” value of a compound of the invention can be greater for normal cells than for cells exhibiting a proliferative disorder, e.g., breast cancer cells. The value depends on the assay used.

By a “standard” is meant a positive or negative control. A negative control in the context of HER2 expression levels is, e.g., a sample possessing an amount of HER2 protein that correlates with a normal cell. A negative control may also include a sample that contains no HER2 protein. By contrast, a positive control does contain HER2 protein, preferably of an amount that correlates with overexpression as found in proliferative disorders, e.g., breast cancers. The controls may be from cell or tissue samples, or else contain purified ligand (or absent ligand), immobilized or otherwise. In some embodiments, one or more of the controls may be in the form of a diagnostic “dipstick.”

By “selectively targeting” is meant affecting one type of cell to a greater extent than another, e.g., in the case of cells with high as opposed to relatively low or normal HER2 levels.

II Compounds of the Invention

Compounds of the invention and their polymorphs, solvates, esters, tautomers, diastereomers, enantiomers, pharmaceutically acceptable salts or prodrugs show utility for inhibiting HSP90 and treating and/or preventing diseases that are HSP90-dependent.

One embodiment of the compounds of the invention is of Formula A:

or a polymorph, solvate, ester, tautomer, diastereomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, wherein:

-   -   X¹ and X² are the same or different and each is nitrogen or         —CR⁶;     -   X³ is nitrogen or —CR³ wherein R³ is hydrogen, OH, a keto         tautomer, —OR⁸, —CN, halogen, lower alkyl, or —C(O)R⁹;     -   X⁴ is nitrogen or a group CR⁶ when X³ is nitrogen, and X⁴ is         —CR⁶R⁷ when X₃ is —CR³.     -   R¹ is halogen, —OR⁸, —SR⁸, or lower alkyl;     -   R² is —NR⁸R¹⁰,     -   R⁴ is —(CH₂)_(n)— wherein n=0–3, —C(O), —C(S), —SO₂—, or —SO₂N—;         and     -   R⁵ is alkyl, aryl, heteroaryl, alicyclic, or heterocyclic, each         of which is optionally bi-or tricyclic, and optionally         substituted with H, halogen, lower alkyl, lower alkenyl, lower         alkynyl, lower aryl, lower alicyclic, arylalkyl, aryloxyalkyl,         alkoxyalkyl, perhaloalkyl, perhaloalkyloxy, perhaloacyl, —N₃,         —SR⁸, —OR⁸, —CN, —CO₂R⁹, —NO₂, or —NR⁸R¹⁰;     -   with the provisos that:     -   the one not found or described in one or more of JP 10025294;         U.S. Pat. No. 4,748,177; U.S. Pat. No. 4,748,177; U.S. Pat. No.         6,369,092; WO 00/06573; WO 02/055521; WO 02/055082; WO         02/055083; Eur. J. Med. Chem., 1994, 29(1), 3–9; and J. Het.         Chem. 1990, 27(5), 1409;     -   —R⁴R⁵ is not a ribose or derivative thereof, or a sugar or         derivative thereof;     -   —R⁴R⁵ does not form with the remainder of said compound a         phosphonate or phosphonic acid, and     -   when R⁴ is (CH₂)_(n) where n=0 or 1, then R⁴ and R⁵ are not         connected with ‘O’, e.g., —CH₂—O—CH₂— or —CH₂—CH₂—O—CH₂—.

In one embodiment, the compound, tautomer, pharmaceutically acceptable salt thereof, or prodrug thereof of Formula A, X¹ and X₂ are the same or different and each is nitrogen or —CR⁶; R¹ is halogen, —OR⁸, —SR⁸, or lower alkyl; R² is —NR⁸R¹⁰; R³ is hydrogen, —OH or keto tautomer, —OR⁸, halogen, —CN, lower alkyl, or —C(O)R⁹; R⁴ is —(CH₂)_(n)— wherein n=0–3, —C(O), —C(S), —SO₂—, or —SO₂N—; and R⁵ is alkyl, aromatic, heteroaromatic, alicyclic, heterocyclic, each of which is optionally bi- or tricyclic, and optionally substituted with H, halogen, lower alkyl, —SR⁸, —OR⁸, —CN, —CO₂R⁹, —NO₂ or —NR⁸R¹⁰; R⁸ is hydrogen, lower alkyl, lower aryl or —(CO)R⁹; R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR⁸R¹⁰ or OR¹¹; R¹¹ is lower alkyl or lower aryl; and R¹⁰ is hydrogen or lower alkyl.

In one embodiment, the compound, tautomer, pharmaceutically acceptable salt thereof, or prodrug thereof of Formula A, R¹ is selected from halogen, hydroxyl, lower alkoxy, lower thioalkyl and C₁₋₄ alkyl; and R² is —NH₂.

In another embodiment, R⁴ is —(CH₂)_(n)—, wherein n=0–3.

In another embodiment, R¹ is selected from halogen, hydroxyl, lower alkoxy, lower thioalkyl or C₁₋₄ alkyl; optionally wherein R² is NH₂.

In another embodiment, R⁴ is —(CH₂)_(n)—, wherein n=0–3.

In another embodiment, R⁴ is —(CH₂)_(n)—, wherein n=0–3, R¹ is selected from halogen, hydroxyl, lower alkoxy, lower thioalkyl, and C₁₋₄ alkyl, and R₂ is optionally NH₂.

In another embodiment, R¹ is halogen, hydroxyl, lower alkoxy, lower thioalkyl, or C₁₋₄ alkyl; and R² is optionally NH₂, R⁴ is —(CH₂)—, and R⁵ is phenyl, benzyl, or pyridyl, all optionally substituted with H, halogen, lower alkyl, —SR⁸, —OR⁸ (or cyclic ethers such as methylenedioxy), —CN, —C0₂R⁹, —NO₂, or —NR⁸R¹⁰; R⁸ is hydrogen, lower alkyl, lower aryl or —(CO)R⁹; R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR⁸R¹⁰ or —OR¹¹; R¹¹ is lower alkyl or lower aryl; and R¹⁰ is hydrogen or lower alkyl.

In another embodiment R¹ is halogen, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H or halogen, and R⁵ is phenyl optionally substituted with H, halogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, C₁₋₄ alkylthio, perhaloalkyl, perhaloalkyloxy, —CN, —NO₂, —NH₂ or —CO₂R¹¹.

In another embodiment, R¹ is halogen, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H, and R⁵ is 2-halo-3,5-dimethoxyphenyl optionally substituted with H, halogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, C₁₋₄ alkylthio, perhaloalkyl, perhaloalkyloxy, —CN, —NO₂, —NH₂, or —CO₂R¹¹ at the para (4-) position.

In another embodiment, R¹ is chloro, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H and R⁵ is 2-chloro-3,4,5-trimethoxyphenyl.

In another embodiment, R¹ is chloro, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H and R⁵ is 2-bromo-3,4,5-trimethoxyphenyl.

In other embodiments, R⁵ is selected from 2-iodo-3,4,5-trimethoxyphenyl, 2-fluoro-3,4,5-trimethoxyphenyl, and 2-bromo-3,4,5-trimethoxyphenyl.

Any of the forgoing embodiments can be combined where feasible and appropriate.

In another embodiment, the invention provides compounds of Formula A1:

or a polymorph, solvate,.ester, tautomer, diastereomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, wherein:

-   -   X¹ and X² are the same or different and each is nitrogen or         —CR⁶;     -   R¹ is halogen, —OR⁸, —SR⁸, or lower alkyl;     -   R² is —NR⁸R¹⁰;     -   R⁴ is —(CH₂)_(n)— wherein=0–3, —C(O), —C(S), —SO₂—, or —SO₂N—;     -   R⁶ is hydrogen, halogen, lower alkyl, —SR⁸, —OR⁸, —NR⁸R¹⁰, —N₃,         —CN, or —C(O)R⁹;     -   R⁵ is alkyl, aryl, heteroaryl, alicyclic, or heterocyclic, all         optionally bi- or tri-cyclic, and all optionally substituted         with H, halogen, lower alkyl, —SR⁸, —OR⁸, —CN, —CO₂R⁹, —NO², or         —NR⁸R¹⁰;     -   R⁸ is hydrogen, lower alkyl, lower aryl, or —(CO)R⁹;     -   R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR⁸R¹⁰ or         —OR¹¹;     -   R¹⁰ is hydrogen or lower alkyl,     -   R¹¹ is lower alkyl or lower aryl.

In one embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is halogen, hydroxyl, lower alkoxy, lower thioalkyl, or C₁₋₄ alkyl; and R² is NH₂.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R⁴ is —(CH₂)_(n)—, where n=0–3.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is halogen, hydroxyl, lower alkoxy, lower thioalkyl, or C₁₋₄ alkyl; and R¹ is NH₂; R⁴ is —(CH₂)_(n)—, wherein n=0–3.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt thereof, R¹ is halogen; R² is NH₂, R⁴ is —CH₂—.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R⁴ is —(CH₂)—; R⁵ is phenyl, benzyl, or pyridyl, and is independently optionally substituted with H, halogen, lower alkyl, —SR⁸, —OR⁸ (or cyclic ethers such as methylenedioxy), —CN, —CO₂R⁹, —NO₂, or —NR⁸R¹⁰; R⁸ is hydrogen, lower alkyl, lower aryl or —(CO)R⁹; R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR⁸R¹⁰ or —OR¹¹; R¹¹ is lower alkyl or lower aryl; and R¹⁰ is hydrogen or lower alkyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is halogen, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H or halogen, R⁵ is phenyl optionally substituted with H, halogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, C₁₋₄ alkylthio, perhaloalkyl, perhaloalkyloxy, —CN, —NO₂, —NH₂ or —CO₂R¹¹.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is halogen, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H, wherein R⁵ is 2-halo-3,5-dimethoxyphenyl optionally substituted with H, halogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, C₁₋₄ alkylthio, perhaloalkyl, perhaloalkyloxy, —CN, —NO₂, —NH₂, or —CO₂R¹¹ at the para (4-) position.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is chloro, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H and R⁵ is 2-chloro-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is chloro, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H and R⁵ is 2-bromo-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R₁ is chloro, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H and R⁵ is 2-iodo-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R₁ is chloro, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H and R⁵ is 2-fluoro-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R₁ is bromo, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H, and R⁵ is 2-bromo-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R₁ is bromo, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H, and R⁵ is 2-iodo-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R₁ is bromo, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H and R⁵ is 2-iodo-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is bromo, R² is —NH₂, R⁴ is —CH₂—, R⁶ is H and R⁵ is 2-fluoro-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is chloro, R² is —NH₂, R⁴ is —CH₂—, R⁶ is halo and R⁵ is 2-chloro-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is chloro, R² is NH₂, R⁴ is —CH₂—, R⁶ is halo, and R⁵ is 2-bromo-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is bromo, R² is —NH₂, R⁴ is —CH₂—, R⁶ is halo and R⁵ is 2-chloro-3,4,5-trimethoxyphenyl.

In another embodiment of the compounds of Formula A1, or tautomer, pharmaceutically acceptable salt, or prodrug thereof, R¹ is bromo, R² is —NH₂, R⁴ is —CH₂—, R⁶ is halo and R⁵ is 2-bromo-3,4,5-trimethoxyphenyl.

In another embodiment, the invention provides compounds of Formula I:

or a polymorph, solvate, ester, enantiomer, diastereomer, tautomer, pharmaceutically acceptable salt or prodrug thereof, wherein:

-   -   R¹ is halogen or lower alkyl;     -   R² is NR⁸R¹⁰;     -   R⁴ is —CHR¹²—;     -   R³ is hydrogen, halogen, or —CN;     -   R⁵ is aryl, heteroaryl, alicyclic, or heterocyclic, wherein         -   the aryl group is substituted with 3 to 5 substituents,         -   the heteroaryl group is substituted with 2 to 5             substituents, wherein when the heteroaryl is substituted             with only two substituents, the two substituents must form             part of an optionally substituted fused ring,         -   the alicyclic group is substituted with 3 to 5 substituents,         -   the heterocyclic group is substituted with 3 to 5             substituents, and         -   the substituents are selected from the group of halogen,             lower alkyl, lower alkenyl, lower alkynyl, lower aryl, lower             alicyclic, arylalkyl, aryloxy, aryloxyalkyl, alkoxyalkyl,             perhaloalkyl, perhaloalkyloxy, perhaloacyl, —N₃, —SR⁸, —OR⁸,             —CN, —C(O)R⁹, —NO₂, —NR⁸R¹⁰, phosphonate and phosphonic             acid;     -   R⁸ is hydrogen, lower alkyl, lower aryl, or —C(O)R⁹;     -   R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR¹⁰R¹⁰ or         —OR¹¹;     -   R¹⁰ is independently hydrogen or lower alkyl;     -   R¹¹ is lower alkyl, lower aryl or lower heteroaryl;     -   R¹² is hydrogen or lower alkyl;         provided that     -   when R⁵ is aryl, R⁵ is not an organo-metallic cyclopentadiene;     -   when R⁵ is phenyl, the substituents are not 3,5 di-halo;     -   when R⁵ is alicyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons;     -   when R⁵ is heterocyclic, the ring system does not contain any         tetra-substituted ring carbons and the ring system is not a         tetra-substituted pyrrolidine.

In one embodiment of the compounds of Formula I or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, wherein: R¹ is halogen or methyl; and R² is —NHR⁸, where R⁸ is hydrogen or —C(O)R⁹.

In another embodiment of the compounds of Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is halogen; R² is —NH₂ and R³ is hydrogen.

In another embodiment of the compounds of Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R⁴ is —(CH₂)—.

In another embodiment of the compounds of Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is halogen; R² is —NH₂; R⁴ is lower alkyl; R³ is hydrogen; and R⁵ is aryl or heteroaryl, wherein each of said aryl and heteroaryl groups is monocyclic or bicyclic, the aryl group is substituted with 4 to 5 substituents, the heteroaryl group is substituted with 2 to 5 substituents, wherein when the heteroaryl is substituted with only two substituents, the two substituents must form part of an optionally substituted fused ring.

In another embodiment of the compounds of Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is halogen; R² is —NH₂; R³ is hydrogen; R⁵ is aryl or heteroaryl, wherein each of said aryl and heteroaryl groups is monocyclic or bicyclic, the aryl group is substituted with 4 to 5 substituents, the heteroaryl group is substituted with 2 to 5 substituents, wherein when the heteroaryl is substituted with only two substituents, the two substituents must form part of an optionally substituted fused ring.

In another embodiment of the compounds of Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is a phenyl having 3 to 5 substituents.

In another embodiment of the compounds of Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is a pyridyl having 3 to 5 substituents.

In another embodiment of the compounds of Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is an 1-oxy-pyridyl(N-oxy-pyridyl) having 3 to 5 substituents.

In another embodiment of the compounds of Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, each of the aryl, heteroaryl, alicyclic or heterocyclic group is monocyclic or bicyclic.

In another embodiment, the invention provides compounds of Formula II, which are compounds of Formula I where R⁴ is —CH₂—,

or a polymorph, solvate, ester, tautomer, enantiomer, diastereomer, pharmaceutically acceptable salt or prodrug thereof, wherein:

-   -   R¹ is halogen or lower alkyl;     -   R² is —NR⁸R¹⁰;     -   R³ is hydrogen, halogen, or —CN;     -   R⁵ is aryl, heteroaryl, alicyclic, or heterocyclic, wherein         -   the aryl group is substituted with 3 to 5 substituents,         -   the heteroaryl group is substituted with 2 to 5             substituents, wherein when the heteroaryl is substituted             with only two substituents, the two substituents must form             part of an optionally substituted fused ring,         -   the alicyclic group is substituted with 3 to 5 substituents,         -   the heterocyclic group is substituted with 3 to 5             substituents, and         -   the substituents are selected from the group of halogen,             lower alkyl, lower alkenyl, lower alkynyl, lower aryl, lower             alicyclic, arylalkyl, aryloxy, aryloxyalkyl, alkoxyalkyl,             perhaloalkyl, perhaloalkyloxy, perhaloacyl, —N₃, —SR⁸, —OR⁸,             —CN, —C(O)R⁹, —NO₂, —NR⁸R¹⁰, phosphonate and phosphonic             acid;     -   R⁸ is hydrogen, lower alkyl, lower aryl, or —C(O)R⁹;     -   R⁹ is lower alkyl lower aryl, lower heteroaryl, —NR¹⁰R¹⁰ or         —OR¹¹;     -   R¹⁰ is independently hydrogen or lower alkyl;     -   R¹¹ is lower alkyl, lower aryl of lower hetero aryl;         provided that     -   when R⁵ is aryl, R⁵ is not an organo-metallic cyclopentadiene;     -   when R⁵ is phenyl, the substituents are not 3,5 di-halo;     -   when R⁵ is alicyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons;     -   when R⁵ is heterocyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons or the ring system is not a         tetra-substituted pyrrolidine.

In another embodiment of the compounds of Formula II, each of the aryl, heteroaryl, alicyclic or heterocyclic group is monocyclic or bicyclic.

In another embodiment of the compounds of Formula II, or a polymorph, solvate, ester, tautomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is halogen or methyl; and R² is —NHR⁸, where R⁸ is hydrogen or —C(O)R⁹.

In another embodiment of the compounds of Formula II, or a polymorph, solvate, ester, tautomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is halogen.

In another embodiment of the compounds of Formula II, or a polymorph, solvate, ester, tautomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, R² is —NH₂ and R³ is hydrogen.

In another embodiment of the compounds of Formula II, or a polymorph, solvate, ester, tautomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is halogen; R² is —NH₂; R³ is hydrogen; R⁵ is aryl or heteroaryl, wherein each of the aryl and heteroaryl groups is monocyclic or bicyclic, the aryl group is substituted with 4 to 5 substituents, the heteroaryl group is substituted with 2 to 5 substituents, wherein when the heteroaryl is substituted with only two substituents, the two substituents must form part of an optionally substituted fused ring.

In another embodiment of the compounds of Formula II, or a polymorph, solvate, ester, tautomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is a phenyl having 3 to 5 substituents.

In another embodiment of the compounds of Formula II, or a polymorph, solvate, ester, tautomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is a pyridyl having 3 to 5 substituents.

In another embodiment of the compounds of Formula II, or a polymorph, solvate, ester, tautomer, enantiomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is an 1-oxy-pyridyl(N-oxy-pyridyl) having 3 to 5 substituents.

It should be understood that any of the foregoing embodiments can be combined where feasible and appropriate.

In another embodiment, the invention provides compounds, or polymorphs, solvates, esters, tautomers, pharmaceutically acceptable salts or prodrugs thereof, prepared by the process comprising:

-   -   reacting a compound of formula Y and a compound of formula Z,         wherein:     -   Y is represented by any of the following formulae:

and

-   -   Z is L¹-R⁴—R⁵; wherein:         -   L¹ is halogen, NR⁸R¹⁰ triflate, tosylate, or mesylate,         -   R⁴ is —CHR¹²—,         -   R⁵ is aryl, heteroaryl, alicyclic, or heterocyclic, wherein:             -   the-aryl group is substituted with 3 to 5 substituents,             -   the heteroaryl group is substituted with 2 to 5                 substituents, wherein when the heteroaryl is substituted                 with only two substituents, the two substituents must                 form part of an optionally substituted fused ring,             -   the alicyclic group is substituted with 3 to 5                 substituents,             -   the heterocyclic group is substituted with 3 to 5                 substituents, and             -   the substituents are selected from the group of halogen,                 lower alkyl, lower alkenyl, lower alkynyl, lower aryl,                 lower alicyclic, arylalkyl, aryloxy, aryloxyalkyl,                 alkoxyalkyl, perhaloalkyl, perhaloalkyloxy, perhaloacyl,                 —N₃, —SR⁸, —OR⁸, —CN, —C(O)R⁹, —NO₂, —NR⁸R¹⁰,                 phosphonate and phosphonic acid;         -   R⁸ is hydrogen, lower alkyl, lower aryl, or —C(O)R⁹;         -   R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR¹⁰R¹⁰ or             —OR¹¹;         -   R¹⁰ is independently hydrogen or lower alkyl;         -   R¹¹ is lower alkyl, lower aryl or lower heteroaryl;         -   R¹² is hydrogen or lower alkyl;         -   R²¹ is halogen, lower alkyl or —OH;         -   R²² is —NR⁸R¹⁰;         -   R²³ is hydrogen, halogen, or —CN;         -   R²⁴ is —NH₂, —NO₂ or —NO;         -   R²⁵ is halogen or —OH;         -   R²⁶ is —C(O)NH₂ or C(O)OEt; and         -   R²⁷ is —NH2, —OH or halogen;             provided that:     -   when R⁵ is aryl, R⁵ is not an organo-metallic cyclopentadiene;     -   when R⁵ is phenyl, the substituents are not 3,5 di-halo;     -   when R⁵ is alicyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons; or     -   when R⁵ is heterocyclic, the ring system does not contain any         tetra-substituted sp³ ring carbons or the ring system is not a         tetra-substituted pyrrolidine.

In one embodiment of the compounds prepared by the process of the invention, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R⁵ is aryl, heteroaryl, alicyclic, or heterocyclic, each of which is optionally mono- or bicyclic.

In another embodiment of the compounds prepared by the process of the invention, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R⁴ is —CH₂—.

In another embodiment of the compounds prepared by the process of the invention, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, L¹ is —Cl, —Br or NH₂; R⁵ is aryl or heteroaryl, wherein the aryl group is substituted with 4 to 5 substituents and the heteroaryl group is substituted with 2 to 5 substituents wherein when the heteroaryl is substituted with only two substituents, the two substituents must form part of an optionally substituted fused ring.

In another embodiment of the compounds prepared by the process of the invention, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, Y is a substituted purine.

In another embodiment of the compounds prepared by the process of the invention, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, the reaction is performed in a solvent comprising a member selected from the group of DMF, THF and DMSO.

In another embodiment of the compounds prepared by the process of the invention, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, the reaction is performed in a solvent that comprises DMF.

Compounds for use in the method of treatment of the invention are HSP90 inhibitors of the following Formula I, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof,

wherein:

-   -   R¹ is halogen, —OR¹¹, —SR¹¹, —NHR⁸, hydrogen, or lower alkyl;     -   R² is —NR⁸R¹⁰;     -   R³ is hydrogen, halogen, —N₃, or —CN;     -   R⁴ is —(CHR¹²)_(n)— where n=0, 1 or 2, —C(O)—, —C(S)—, or         —S(O)—;     -   R⁵ is alkyl, aryl, heteroaryl, alicyclic, or heterocyclic, all         optionally substituted with halogen, lower alkyl, lower alkenyl,         lower alkynyl, lower aryl, lower alicyclic, arylalkyl, aryloxy,         aryloxyalkyl, alkoxyalkyl, perhaloalkyl, perhaloalkyloxy,         perhaloacyl, —N₃, —SR⁸, —OR⁸, —CN, —C(O)R⁹, —NO₂, or —NR⁸R¹⁰;     -   R⁸ is hydrogen, lower alkyl, lower aryl, or —C(O)R⁹;     -   R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR¹⁰R¹⁰, or         —OR¹¹;     -   R¹⁰ is independently hydrogen or lower alkyl;     -   R¹¹ is lower alkyl, lower aryl or lower heteroaryl;     -   R¹² is hydrogen or lower alkyl;         provided that:     -   —R⁴R⁵ is not a ribose or derivative thereof, or a sugar or         derivative thereof;     -   —R⁴R⁵ does not form with the remainder of said compound a         phosphonate or phosphonic acid; and     -   when R⁴ is —(CH₂)_(n)— where n=1 or 2, then R⁴ and R⁵ are not         connected through an ether linkage.

In one embodiment of the compounds of Formula I for the method of the invention, R³ is hydrogen, halogen or —CN; R⁵ is aryl, heteroaryl, alicyclic, or heterocyclic, all optionally substituted with halogen, lower alkyl, lower alkenyl, lower alkynyl, lower aryl, lower alicyclic, arylalkyl, aryloxy, aryloxyalkyl, alkoxyalkyl, perhaloalkyl, perhaloalkyloxy, perhaloacyl, —N₃, —SR⁸, —OR⁸, —CN, —C(O)R⁹, —NO₂, or —NR⁸R¹⁰.

In another embodiment of the compounds of Formula I for the method of the invention, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, R¹ is halogen or methyl and R² is —NHR⁸, where R⁸ is hydrogen or —C(O)R⁹.

In another embodiment of the compounds of Formula I for the method of the invention, R² is —NH₂ and R³ is hydrogen.

In another embodiment of the compounds of Formula I for the method of the invention, R⁴ is —CH₂—.

In another embodiment of the compounds of Formula I for the method of the invention, R¹ is halogen; R² is —NH₂; R³ is hydrogen; R⁴ is —CH₂—; R⁵ is aryl or heteroaryl, the aryl and heteroaryl groups are monocyclic or bicyclic, the aryl group is substituted with 4 to 5 substituents, the heteroaryl group is substituted with 2 to 5 substituents, wherein when the heteroaryl is substituted with two substituents, the two substituents must form part of an optionally substituted fused ring.

In another embodiment of the compounds of Formula I for the method of the invention, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is a phenyl having 3 to 5 substituents.

In another embodiment of the compounds of Formula I for the method of the invention, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is a pyridyl having 3 to 5 substituents.

In another embodiment of the compounds of Formula I for the method of the invention, R¹ is chloro or bromo, R² is —NH₂, and R⁵ is an 1-oxy-pyridyl(N-oxy-pyridyl) having 3 to 5 substituents.

It should be understood that any of the foregoing embodiments can be combined where feasible and appropriate.

Compounds of the invention that are based on the following Formula I′ have illustrative as described in TABLE 1. Suitable prodrugs which can be employed by these compounds include,but are not limited to, those listed in the Definition section.

TABLE 1 Exemplary Compounds of the Invention of Formula I′

No. Ex. R¹ R³ R⁴ R⁵ 1 48 Cl H CH₂ 3,4,5-Trimethoxyphenyl 2 98 Cl H CH₂ 2-Chloro-3,4,5-trimethoxyphenyl 3 51 Cl H CH₂ 2-Bromo-3,4,5-trimethoxyphenyl 4 106 Cl H CH₂ 2-Iodo-3,4,5-trimethoxyphenyl 5 Cl H CH₂ 2-Fluoro-3,4,5-trimethoxyphenyl 6 Cl H CH₂ 3,4,5-Trimethylphenyl 7 Cl H CH₂ 2-Chloro-3,4,5-trimethylphenyl 8 Cl H CH₂ 2-Bromo-3,4,5-trimethylphenyl 9 Cl H CH₂ 2-Iodo-3,4,5-trimethylphenyl 10 Cl H CH₂ 2-Fluoro-3,4,5-trimethylphenyl 11 43 Cl H CH₂ 3,5-Dimethoxy-4-methylphenyl 12 Cl H CH₂ 2-Chloro-3,5-dimethoxy-4-methylphenyl 13 44 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-methylphenyl 14 Cl H CH₂ 2-Iodo-3,5-dimethoxy-4-methylphenyl 15 Cl H CH₂ 2-Fluoro-3,5-dimethoxy-4-methylphenyl 16 Cl H CH₂ 3,5-Dichloro-4-methylphenyl 17 Cl H CH₂ 2,3,5-Trichloro-4-methylphenyl 18 Cl H CH₂ 2-Bromo-3,5-dichloro-4-methylphenyl 19 Cl H CH₂ 2-Iodo-3,5-dichloro-4-methylphenyl 20 Cl H CH₂ 2-Fluoro-3,5-dichloro-4-methylphenyl 21. Cl H CH₂ 3,5-Dibromo-4-methylphenyl 22 Cl H CH₂ 2-Chloro-3,5-dibromo-4-methylphenyl 23 Cl H CH₂ 2,3,5-Tribromo-4-methylphenylphenyl 24 Cl H CH₂ 2-Iodo-3,5-dibromo-4-methylphenyl 25 Cl H CH₂ 2-Fluoro-3,5-dibromo-4-methylphenyl 26 Cl H CH₂ 3,5-Dichloro-4-methoxyphenyl 27 Cl H CH₂ 2,3,5-Trichloro-4-methoxyphenyl 28 Cl H CH₂ 2-Bromo-3,5-dichloro-4-methoxyphenyl 29 Cl H CH₂ 2-Iodo-3,5-dichloro-4-methoxyphenyl 30 Cl H CH₂ 2-Fluoro-3,5-dichloro-4-methoxyphenyl 31 Cl H CH₂ 3,5-Dibromo-4-methoxyphenyl 32 Cl H CH₂ 2-Chloro-3,5-dibromo-4-methoxyphenyl 33 Cl H CH₂ 2,3,5-Tribromo-4-methoxyphenyl 34 Cl H CH₂ 2-Iodo-3,5-dibromo-4-methoxyphenyl 35 Cl H CH₂ 2-Fluoro-3,5-dibromo-4-methoxyphenyl 36 Cl H CH₂ 3-Chloro-5-bromo-4-methylphenyl 37 Cl H CH₂ 2,3-Dichloro-5-bromo-4-methylphenyl 38 Cl H CH₂ 2,5-Dibromo-3-chloro-4-methylphenyl 39 Cl H CH₂ 2-Iodo-3-chloro-5-bromo-4-methylphenyl 40 Cl H CH₂ 2-Fluoro-3-chloro-5-bromo-4-methylphenyl 41 Cl H CH₂ 3-Chloro-5-bromo-4-methoxyphenylphenyl 42 Cl H CH₂ 2,3-Dichloro-5-bromo-4-methoxyphenyl 43 Cl H CH₂ 2,5-Dibromo-3-chloro-4-methoxyphenyl 44 Cl H CH₂ 2-Iodo-3-chloro-5-bromo-4-methoxyphenyl 45 Cl H CH₂ 2-Fluoro-3-chloro-5-bromo-4-methoxyphenyl 46 Cl H CH₂ 3-Bromo-5-chloro-4-methylphenyl 47 Cl H CH₂ 2,5-Dichloro-3-bromo-4-methylphenyl 48 Cl H CH₂ 2,3-Dibromo-5-chloro-4-methylphenyl 49 Cl H CH₂ 2-Iodo-3-bromo-5-chloro-4-methylphenyl 50 Cl H CH₂ 2-Fluoro-3-bromo-5-chloro-4-methylphenyl 51 Cl H CH₂ 3-Bromo-5-chloro-4-methoxyphenyl 52 Cl H CH₂ 2,5-Dichloro-3-bromo-4-methoxyphenyl 53 Cl H CH₂ 2,3-Dibromo-5-chloro-4-methoxyphenyl 54 Cl H CH₂ 2-Iodo-3-bromo-5-chloro-4-methoxyphenyl 55 Cl H CH₂ 2-Fluoro-3-bromo-5-chloro-4-methoxyphenyl 56 Cl H CH₂ 3,5-Dimethoxy-4-trifluoromethylphenyl 57 Cl H CH₂ 2-Chloro-3,5-dimethoxy-4-trifluoromethylphenyl 58 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-trifluoromethylphenyl 59 Cl H CH₂ 2-Iodo-3,5-dimethoxy-4-trifluoromethylphenyl 60 Cl H CH₂ 2-Fluoro-3,5-dimethoxy-4-trifluoromethylphenyl 61 Cl H CH₂ 3,5-dibromo-4-trifluoromethoxyphenyl 62 Cl H CH₂ 2-Chloro-3,5-dibromo-4-trifluoromethoxyphenyl 63 Cl H CH₂ 2,3,5-Tribromo-4-trifluoromethoxyphenyl 64 Cl H CH₂ 2-Iodo-3,5-dibromo-4-trifluoromethoxyphenyl 65 Cl H CH₂ 2-Fluoro-3,5-dibromo-4-trifluoromethoxyphenyl 66 Cl H CH₂ 3,5-Dimethyl-4-methoxyphenyl 67 Cl H CH₂ 2-Chloro-3,5-dimethyl-4-methoxyphenyl 68 Cl H CH₂ 2-Bromo-3,5-dimethyl-4-methoxyphenyl 69 Cl H CH₂ 2-Lodo-3,5-dimethyl-4-methoxyphenyl 70 Cl H CH₂ 2-Fluoro-3,5-dimethyl-4-methoxyphenyl 71 Cl H CH₂ 3,5-Dimethyl-4-bromophenyl 72 Cl H CH₂ 2-Chloro-3,5-dimethyl-4-bromophenyl 73 Cl H CH₂ 2,4-Dibromo-3,5-dimethylphenyl 74 Cl H CH₂ 2-Iodo-3,5-dimethyl-4-bromophenyl 75 Cl H CH₂ 2-Fluoro-3,5-dimethyl-4-bromophenyl 76 Cl H CH₂ 3,5-Dimethyl-4-chlorophenyl 77 Cl H CH₂ 2,4-Dichloro-3,5-dimethylphenyl 78 Cl H CH₂ 2-Bromo-3,5-dimethyl-4-chlorophenyl 79 Cl H CH₂ 2-Iodo-3,5-dimethyl-4-chlorophenyl 80 Cl H CH₂ 2-Fluoro-3,5-dimethyl-4-chlorophenyl 81 101 Br H CH₂ 3,4,5-Trimethoxyphenyl 82 77 Br H CH₂ 2-Chloro-3,4,5-trimethoxyphenyl 83 102 Br H CH₂ 2-Bromo-3,4,5-trimethoxyphenyl 84 Br H CH₂ 2-Iodo-3,4,5-trimethoxyphenyl 85 Br H CH₂ 2-Fluoro-3,4,5-trimethoxyphenyl 86 Br H CH₂ 3,4,5-Trimethylphenyl 87 Br H CH₂ 2-Chloro-3,4,5-trimethylphenyl 88 Br H CH₂ 2-Bromo-3,4,5-trimethylphenyl 89 Br H CH₂ 2-Iodo-3,4,5-trimethylphenyl 90 Br H CH₂ 2-Fluoro-3,4,5-trimethylphenyl 91 Br H CH₂ 3,5-Dimethoxy-4-methylphenyl 92 Br H CH₂ 2-Chloro-3,5-dimethoxy-4-methylphenyl 93 Br H CH₂ 2-Bromo-3,5-dimethoxy-4-methylphenyl 94 Br H CH₂ 2-Iodo-3,5-dimethoxy-4-methylphenyl 95 Br H CH₂ 2-Fluoro-3,5-dimethoxy-4-methylphenyl 96 Br H CH₂ 3,5-Dichloro-4-methylphenyl 97 Br H CH₂ 2,3,5-Trichloro-4-methylphenyl 98 Br H CH₂ 2-Bromo-3,5-dichloro-4-methylphenyl 99 Br H CH₂ 2-Iodo-3,5-dichloro-4-methylphenyl 100 Br H CH₂ 2-Fluoro-3,5-dichloro-4-methylphenyl 101 Br H CH₂ 3,5-Dibromo-4-methylphenyl 102 Br H CH₂ 2-Chloro-3,5-dibromo-4-methylphenyl 103 Br H CH₂ 2,3,5-Tribromo-4-methylphenylphenyl 104 Br H CH₂ 2-Iodo-3,5-dibromo-4-methylphenyl 105 Br H CH₂ 2-Fluoro-3,5-dibromo-4-methylphenyl 106 Br H CH₂ 3,5-Dichloro-4-methoxyphenyl 107 Br H CH₂ 2,3,5-Trichloro-4-methoxyphenyl 108 Br H CH₂ 2-Bromo-3,5-dichloro-4-methoxyphenyl 109 Br H CH₂ 2-Iodo-3,5-dichloro-4-methoxyphenyl 110 Br H CH₂ 2-Fluoro-3,5-dichloro-4-methoxyphenyl 111 Br H CH₂ 3,5-Dibromo-4-methoxyphenyl 112 Br H CH₂ 2-Chloro-3,5-dibromo-4-methoxyphenyl 113 Br H CH₂ 2,3,5-Tribromo-4-methoxyphenyl 114 Br H CH₂ 2-Iodo-3,5-dibromo-4-methoxyphenyl 115 Br H CH₂ 2-Fluoro-3,5-dibromo-4-methoxyphenyl 116 Br H CH₂ 3-Chloro-5-bromo-4-methylphenyl 117 Br H CH₂ 2,3-Dichloro-5-bromo-4-methylphenyl 118 Br H CH₂ 2,5-Dibromo-3-chloro-4-methylphenyl 119 Br H CH₂ 2-Iodo-3-chloro-5-bromo-4-methylphenyl 120 Br H CH₂ 2-Fluoro-3-chloro-5-bromo-4-methylphenyl 121 Br H CH₂ 3-Chloro-5-bromo-4-methoxyphenylphenyl 122 Br H CH₂ 2,3-Dichloro-5-bromo-4-methoxyphenyl 123 Br H CH₂ 2,5-Dibromo-3-chloro-4-methoxyphenyl 124 Br H CH₂ 2-Iodo-3-chloro-5-bromo-4-methoxyphenyl 125 Br H CH₂ 2-Fluoro-3-chloro-5-bromo-4-methoxyphenyl 126 Br H CH₂ 3-Bromo-5-chloro-4-methylphenyl 127 Br H CH₂ 2,5-Dichloro-3-bromo-4-methylphenyl 128 Br H CH₂ 2,3-Dibromo-5-chloro-4-methylphenyl 129 Br H CH₂ 2-Iodo-3-bromo-5-chloro-4-methylphenyl 130 Br H CH₂ 2-Fluoro-3-bromo-5-chloro-4-methylphenyl 131 Br H CH₂ 3-Bromo-5-chloro-4-methoxyphenyl 132 Br H CH₂ 2,5-Dichloro-3-bromo-4-methoxyphenyl 133 Br H CH₂ 2,3-Dibromo-5-chloro-4-methoxyphenyl 134 Br H CH₂ 2-Iodo-3-bromo-5-chloro-4-methoxyphenyl 135 Br H CH₂ 2-Fluoro-3-bromo-5-chloro-4-methoxyphenyl 136 Br H CH₂ 3,5-Dimethoxy-4-trifluoromethylphenyl 137 Br H CH₂ 2-Chloro-3,5-dimethoxy-4-trifluoromethylphenyl 138 Br H CH₂ 2-Bromo-3,5-dimethoxy-4-trifluoromethylphenyl 139 Br H CH₂ 2-Iodo-3,5-dimethoxy-4-trifluoromethylphenyl 140 Br H CH₂ 2-Fluoro-3,5-dimethoxy-4-trifluoromethylphenyl 141 Br H CH₂ 3,5-Dibromo-4-trifluoromethoxyphenyl 142 Br H CH₂ 2-Chloro-3,5-dibromo-4-trifluoromethoxyphenyl 143 Br H CH₂ 2,3,5-Tribromo-4-trifluoromethoxyphenyl 144 Br H CH₂ 2-Iodo-3,5-dibromo-4-trifluoromethoxyphenyl 145 Br H CH₂ 2-Fluoro-3,5-dibromo-4-trifluoromethoxyphenyl 146 Br H CH₂ 3,5-Dimethyl-4-methoxyphenyl 147 Br H CH₂ 2-Chloro-3,5-dimethyl-4-methoxyphenyl 148 Br H CH₂ 2-Bromo-3,5-dimethyl-4-methoxyphenyl 149 Br H CH₂ 2-Iodo-3,5-dimethyl-4-methoxyphenyl 150 Br H CH₂ 2-Fluoro-3,5-dimethyl-4-methoxyphenyl 151 Br H CH₂ 3,5-Dimethyl-4-bromophenyl 152 Br H CH₂ 2-Chloro-3,5-dimethyl-4-bromophenyl 153 Br H CH₂ 2,4-Dibromo-3,5-dimethylphenyl 154 Br H CH₂ 2-Iodo-3,5-dimethyl-4-bromophenyl 155 Br H CH₂ 2-Fluoro-3,5-dimethyl-4-bromophenyl 156 Br H CH₂ 3,5-Dimethyl-4-chlorophenyl 157 Br H CH₂ 2,4-Dichloro-3,5-dimethylphenyl 158 Br H CH₂ 2-Bromo-3,5-dimethyl-4-chlorophenyl 159 Br H CH₂ 2-Iodo-3,5-dimethyl-4-chlorophenyl 160 F H CH₂ 3,4,5-Trimethoxyphenyl 161 F H CH₂ 2-Chloro-3,4,5-trimethoxyphenyl 162 F H CH₂ 2-Bromo-3,4,5-trimethoxyphenyl 163 F H CH₂ 2-Iodo-3,4,5-trimethoxyphenyl 164 F H CH₂ 2-Fluoro-3,4,5-trimethoxyphenyl 165 F H CH₂ 3,4,5-Trimethylphenyl 166 F H CH₂ 2-Chloro-3,4,5-trimethylphenyl 167 F H CH₂ 2-Bromo-3,4,5-trimethylphenyl 168 F H CH₂ 2-Iodo-3,4,5-trimethylphenyl 169 F H CH₂ 2-Fluoro-3,4,5-trimethylphenyl 170 F H CH₂ 3,5-Dimethoxy-4-methylphenyl 171 F H CH₂ 2-Chloro-3,5-dimethoxy-4-methylphenyl 172 F H CH₂ 2-Bromo-3,5-dimethoxy-4-methylphenyl 173 F H CH₂ 2-Iodo-3,5-dimethoxy-4-methylphenyl 174 F H CH₂ 2-Fluoro-3,5-dimethoxy-4-methylphenyl 175 F H CH₂ 3,5-Dichloro-4-methylphenyl 176 F H CH₂ 2,3,5-Trichloro-4-methylphenyl 177 F H CH₂ 2-Bromo-3,5-dichloro-4-methylphenyl 178 F H CH₂ 2-Iodo-3,5-dichloro-4-methylphenyl 179 F H CH₂ 2-Fluoro-3,5-dichloro-4-methylphenyl 180 F H CH₂ 3,5-Dibromo-4-methylphenyl 181 F H CH₂ 2-Chloro-3,5-dibromo-4-methylphenyl 182 F H CH₂ 2,3,5-Tribromo-4-methylphenylphenyl 183 F H CH₂ 2-Iodo-3,5-dibromo-4-methylphenyl 184 F H CH₂ 2-Fluoro-3,5-dibromo-4-methylphenyl 185 F H CH₂ 3,5-Dichloro-4-methoxyphenyl 186 F H CH₂ 2,3,5-Trichloro-4-methoxyphenyl 187 F H CH₂ 2-Bromo-3,5-dichloro-4-methoxyphenyl 188 F H CH₂ 2-Iodo-3,5-dichloro-4-methoxyphenyl 189 F H CH₂ 2-Fluoro-3,5-dichloro-4-methoxyphenyl 190 F H CH₂ 3,5-Dibromo-4-methoxyphenyl 191 F H CH₂ 2-Chloro-3,5-dibromo-4-methoxyphenyl 192 F H CH₂ 2,3,5-Tribromo-4-methoxyphenyl 193 F H CH₂ 2-Iodo-3,5-dibromo-4-methoxyphenyl 194 F H CH₂ 2-Fluoro-3,5-dibromo-4-methoxyphenyl 195 F H CH₂ 3-Chloro-5-bromo-4-methylphenyl 196 F H CH₂ 2,3-Dichloro-5-bromo-4-methylphenyl 197 F H CH₂ 2,5-Dibromo-3-chloro-4-methylphenyl 198 F H CH₂ 2-Iodo-3-chloro-5-bromo-4-methylphenyl 199 F H CH₂ 2-Fluoro-3-chloro-5-bromo-4-methylphenyl 200 F H CH₂ 3-Chloro-5-bromo-4-methoxyphenylphenyl 201 F H CH₂ 2,3-Dichloro-5-bromo-4-methoxyphenyl 202 F H CH₂ 2,5-Dibromo-3-chloro-4-methoxyphenyl 203 F H CH₂ 2-Iodo-3-chloro-5-bromo-4-methoxyphenyl 204 F H CH₂ 2-Fluoro-3-chloro-5-bromo-4-methoxyphenyl 205 F H CH₂ 3-Bromo-5-chloro-4-methylphenyl 206 F H CH₂ 2,5-Dichloro-3-bromo-4-methylphenyl 207 F H CH₂ 2,3-Dibromo-5-chloro-4-methylphenyl 208 F H CH₂ 2-Iodo-3-bromo-5-chloro-4-methylphenyl 209 F H CH₂ 2-Fluoro-3-bromo-5-chloro-4-methylphenyl 210 F H CH₂ 3-Bromo-5-chloro-4-methoxyphenyl 211 F H CH₂ 2,5-Dichloro-3-bromo-4-methoxyphenyl 212 F H CH₂ 2,3-Dibromo-5-chloro-4-methoxyphenyl 213 F H CH₂ 2-Iodo-3-bromo-5-chloro-4-methoxyphenyl 214 F H CH₂ 2-Fluoro-3-bromo-5-chloro-4-methoxyphenyl 215 F H CH₂ 3,5-Dimethoxy-4-trifluoromethylphenyl 216 F H CH₂ 2-Chloro-3,5-dimethoxy-4-trifluoromethylphenyl 217 F H CH₂ 2-Bromo-3,5-dimethoxy-4-trifluoromethylphenyl 218 F H CH₂ 2-Iodo-3,5-dimethoxy-4-trifluoromethylphenyl 219 F H CH₂ 2-Fluoro-3,5-dimethoxy-4-trifluoromethylphenyl 220 F H CH₂ 3,5-Dibromo-4-trifluoromethoxyphenyl 221 F H CH₂ 2-Chloro-3,5-dibromo-4-trifluoromethoxyphenyl 222 F H CH₂ 2,3,5-Tribromo-4-trifluoromethoxyphenyl 223 F H CH₂ 2-Iodo-3,5-dibromo-4-trifluoromethoxyphenyl 224 F H CH₂ 2-Fluoro-3,5-dibromo-4-trifluoromethoxyphenyl 225 F H CH₂ 3,5-Dimethyl-4-methoxyphenyl 226 F H CH₂ 2-Chloro-3,5-dimethyl-4-methoxyphenyl 227 F H CH₂ 2-Bromo-3,5-dimethyl-4-methoxyphenyl 228 F H CH₂ 2-Iodo-3,5-dimethyl-4-methoxyphenyl 229 F H CH₂ 2-Fluoro-3,5-dimethyl-4-methoxyphenyl 230 F H CH₂ 3,5-Dimethyl-4-bromophenyl 231 F H CH₂ 2-Chloro-3,5-dimethyl-4-bromophenyl 232 F H CH₂ 2,4-Dibromo-3,5-dimethylphenyl 233 F H CH₂ 2-Iodo-3,5-dimethyl-4-bromophenyl 234 F H CH₂ 2-Fluoro-3,5-dimethyl-4-bromophenyl 235 F H CH₂ 3,5-Dimethyl-4-chlorophenyl 236 F H CH₂ 2,4-Dichloro-3,5-dimethylphenyl 237 F H CH₂ 2-Bromo-3,5-dimethyl-4-chlorophenyl 238 F H CH₂ 2-Iodo-3,5-dimethyl-4-chlorophenyl 239 F H CH₂ 2-Fluoro-3,5-dimethyl-4-chlorophenyl 240 25 Cl H CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 241 31 Cl H CH₂ 3,5-Dimethyl-4-methoxy-1-oxypyridin-2-yl 242 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-methoxypyridin-2-yl 243 33 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-methoxypyridin-2-yl 244 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-methoxy-1-oxypyridin-2-yl 245 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-methoxy-1-oxypyridin-2-yl 246 1 Cl H CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 247 4 Cl H CH₂ 3,5-Dimethyl-4-bromo-1-oxypyridin-2-yl 248 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-bromopyridin-2-yl 249 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-bromopyridin-2-yl 250 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-bromo-1-oxypyridin-2-yl 251 Cl H CH₂ 4,6-Dibromo-3,5-dimethyl-1-oxypyridin-2-yl 252 18 Cl H CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 253 19 Cl H CH₂ 3,5-Dimethyl-4-chloro-1-oxypyridin-2-yl 254 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-chloropyridin-2-yl 255 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-chloropyridin-2-yl 256 Cl H CH₂ 4,6-Dichloro-3,5-dimethyl-1-oxypyridin-2-yl 257 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-chloro-1-oxypyridin-2-yl 258 111 Cl H CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 259 Cl H CH₂ 3,5-Dimethyl-4-iodo-1-oxypyridin-2-yl 260 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-iodopyridin-2-yl 261 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-iodopyridin-2-yl 262 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-iodo-1-oxypyridin-2-yl 263 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-iodo-1-oxypyridin-2-yl 264 115 Cl H CH₂ 3,5-Dimethyl-4-thiomethyl-pyridin-2-yl 265 Cl H CH₂ 3,5-Dimethyl-4-thiomethyl-1-oxypyridin-2-yl 266 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-thiomethyl-pyridin-2-yl 267 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-thiomethyl-pyridin-2-yl 268 Cl H CH₂ 6-Chloro-3,5-dimethyl-4-thiomethyl-1-oxypyridin-2-yl 269 Cl H CH₂ 6-Bromo-3,5-dimethyl-4-thiomethyl-1-oxypyridin-2-yl 270 117 Cl H CH₂ 3,4,5-Trimethyl-pyridin-2-yl 271 Cl H CH₂ 3,4,5-Trimethyl-1-oxypyridin-2-yl 272 Cl H CH₂ 6-Bromo-3,4,5-trimethyl-pyridin-2-yl 273 Cl H CH₂ 6-Chloro-3,4,5-trimethyl-pyridin-2-yl 274 Cl H CH₂ 6-Chloro-3,4,5-trimethyl-1-oxypyridin-2-yl 275 CI H CH₂ 6-Bromo-3,4,5-trimethyl-1-oxypyridin-2-yl 276 Cl H CH₂ 4,5,6-Trimethoxypyridin-2-yl 277 Cl H CH₂ 4,5,6-Trimethoxy-1-oxypyridin-2-yl 278 Cl H CH₂ 3-Bromo-4,5,6-trimethoxypyridin-2-yl 279 Cl H CH₂ 3-Chloro-4,5,6-trimethoxypyridin-2-yl 280 Cl H CH₂ 3-Chloro-4,5,6-trimethoxy-1-oxypyridin-2-yl 281 CI H CH₂ 3-Bromo-4,5,6-trimethoxy-1-oxypyridin-2-yl 282 Cl H CH₂ 3,4,5-Trimethoxy-pyridin-2-yl 283 Cl H CH₂ 3,4,5-Trimethoxy-1-oxypyridin-2-yl 284 Cl H CH₂ 3-Bromo-3,4,5-trimethoxy-pyridin-2-yl 285 Cl H CH₂ 3-Chloro-3,4,5-trimethoxy-pyridin-2-yL 286 Cl H CH₂ 3-Chloro-3,4,5-trimethoxy-1-oxypyridin-2-yl 287 Cl H CH₂ 3-Bromo-3,4,5-trimethoxy-1-oxypyridin-2-yl 288 Cl H CH₂ 4,5,6-Trimethyl-pyridin-2-yl 289 Cl H CH₂ 4,5,6-Trimethyl-1-oxypyridin-2-yl 290 Cl H CH₂ 3-Bromo-4,5,6-trimethyl-pyridin-2-yl. 291 Cl H CH₂ 3-Chloro-4,5,6-trimethyl-pyridin-2-yl 292 Cl H CH₂ 3-Chloro-4,5,6-trimethyl-1-oxypyridin-2-yl 293 Cl H CH₂ 3-Bromo-4,5,6-trimethyl-1-oxypyridin-2-yl 294 Cl H CH₂ 4,6-Dimethyl-5-methoxy-pyridin-2-yl 295 Cl H CH₂ 4,6-Dimethyl-5-methoxy-1-oxypyridin-2-yl 296 Cl H CH₂ 3-Bromo-4,6-dimethyl-5-methoxy-pyridin-2-yl 297 Cl H CH₂ 3-Chloro-4,6-dimethyl-5-methoxy-pyridin-2-yl 298 Cl H CH₂ 3-Chloro-4,6-dimethyl-5-methoxy-1-oxypyridin-2-yl 299 Cl H CH₂ 3-Bromo-4,6-dimethyl-5-methoxy-1-oxypyridin-2-yl 300 Cl H CH₂ 4-Bromo-5,6-dimethoxy-pyridin-2-yl 301 Cl H CH₂ 4-Bromo-5,6-dimethoxy-1-oxypyridin-2-yl 302 Cl H CH₂ 3,4-Dibromo-5,6-dimethoxy-pyridin-2-yl 303 Cl H CH₂ 3-Chloro-4-bromo-5,6-dimethoxy-pyridin-2-yl 304 Cl H CH₂ 3-Chloro-4-bromo-5,6-dimethoxy-1-oxypyridin-2-yl 305 Cl H CH₂ 3,4-Dibromo-5,6-dimethoxy-1-oxypyridin-2-yl 306 41 Cl H CH₂ 4,6-Dimethyl-5-methoxypyridin-3-yl 307 Cl H CH₂ 4,6-Dimethyl-5-methoxy-1-oxypyridin-3-yl 308 Cl H CH₂ 4,6-Dimethyl-5-bromopyridin-3-yl 309 Cl H CH₂ 4,6-Dimethyl-5-chloropyridin-3-yl 310 Cl H CH₂ 5,6-Dimethyl-4-bromopyridin-3-yl 311 Cl H CH₂ 5,6-Dimethyl-4-chloropyridin-3-yl 312 Cl H CH₂ 4,6-Dimethyl-5-bromo-1-oxypyridin-pyridin-3-yl 313 Cl H CH₂ 4,6-Dimethyl-5-chloro-1-oxypyridin-pyridin-3-yl 314 Cl H CH₂ 5,6-Dimethyl-4-bromo-1-oxypyridin-pyridin-3-yl 315 Cl H CH₂ 5,6-Dimethyl-4-chloro-1-oxypyridin-pyridin-3-yl 316 Cl H CH₂ 2,6-Dimethyl-3-methoxypyridin-4-yl 317 Cl H CH₂ 2,6-Dimethyl-pyridin-4-yl 318 Cl H CH₂ 2,3,6-Trimethyl-pyridin-4-yl 319 Cl H CH₂ 2,3,6-Trimethoxy-pyridin-4-yl 320 Cl H CH₂ 2,6-Dimethyl-3-bromopyridin-4-yl 321 Cl H CH₂ 2,6-Dimethyl-3-chloropyridin-4-yl 322 Cl H CH₂ 2,6-Dichloro-3-bromopyridin-4-yl 323 Cl H CH₂ 2,6-Dibromo-3-chloropyridin-4-yl 324 Cl H CH₂ 2,3,6-Trichloro-pyridin-4-yl 325 Cl H CH₂ 2,3,6-Tribromo-pyridin-4-yl 326 Cl H CH₂ 2,6-Dimethyl-3-methoxy-1-oxy-pyridin-4-yl 327 Cl H CH₂ 2,6-Dimethyl-1-oxy-pyridin-4-yl 328 Cl H CH₂ 2,3,6-Trimethyl-1-oxy-pyridin-4-yl 329 Cl H CH₂ 2,3,6-Trimethoxy-1-oxy-pyridin-4-yl 330 Cl H CH₂ 2,6-Dimethyl-3-bromo-1-oxy-pyridin-4-yl 331 Cl H CH₂ 2,6-Dimethyl-3-chloro-1-oxy-pyridin-4-yl 332 Cl H CH₂ 2,6-Dichloro-3-bromo-1-oxy-pyridin-4-yl 333 Cl H CH₂ 2,6-Dibromo-3-chloro-1-oxy-pyridin-4-yl 334 Cl H CH₂ 2,3,6-Trichloro-1-oxy-pyridin-4-yl 335 Cl H CH₂ 2,3,6-Tribromo-1-oxy-pyridin-4-yl 336 Cl H CH₂ 4,6-Dimethyl-5-iodopyridin-3-yl 337 Cl H CH₂ 5,6-Dimethyl-4-iodopyridin-3-yl 338 Cl H CH₂ 4,5,6-Trichloropyridin-3-yl 339 Cl H CH₂ 4,5,6-Tribromopyridin-3-yl 340 21 Br H CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 341 24 Br H CH₂ 3,5-Dimethyl-4-methoxy-1-oxypyridin-2-yl 342 Br H CH₂ 6-Bromo-3,5-dimethyl-4-methoxypyridin-2-yl 343 Br H CH₂ 6-Chloro-3,5-dimethyl-4-methoxypyridin-2-yl 344 Br H CH₂ 6-Chloro-3,5-dimethyl-4-methoxy-1-oxypyridin-2-yl 345 Br H CH₂ 6-Bromo-3,5-dimethyl-4-methoxy-1-oxypyridin-2-yl 346 5 Br H CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 347 6 Br H CH₂ 3,5-Dimethyl-4-bromo-1-oxypyridin-2-yl 348 Br H CH₂ 6-Bromo-3,5-dimethyl-4-bromopyridin-2-yl 349 Br H CH₂ 6-Chloro-3,5-dimethyl-4-bromopyridin-2-yl 350 Br H CH₂ 6-Chloro-3,5-dimethyl-4-bromo-1-oxypyridin-2-yl 351 Br H CH₂ 4,6-Dibromo-3,5-dimethyl-1-oxypyridin-2-yl 352 Br H CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 353 Br H CH₂ 3,5-Dimethyl-4-chloro-1-oxypyridin-2-yl 354 Br H CH₂ 6-Bromo-3,5-dimethyl-4-chloropyridin-2-yl 355 Br H CH₂ 6-Chloro-3,5-dimethyl-4-chloropyridin-2-yl 356 Br H CH₂ 4,6-Dichloro-3,5-dimethyl-1-oxypyridin-2-yl 357 Br H CH₂ 6-Bromo-3,5-dimethyl-4-chloro-1-oxypyridin-2-yl 358 Br H CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 359 Br H CH₂ 3,5-Dimethyl-4-iodo-1-oxypyridin-2-yl 360 Br H CH₂ 6-Bromo-3,5-dimethyl-4-iodopyridin-2-yl 361 Br H CH₂ 6-Chloro-3,5-dimethyl-4-iodopyridin-2-yl 362 Br H CH₂ 6-Chloro-3,5-dimethyl-4-iodo-1-oxypyridin-2-yl 363 Br H CH₂ 6-Bromo-3,5-dimethyl-4-iodo-1-oxypyridin-2-yl 364 Br H CH₂ 3,5-Dimethyl-4-thiomethyl-pyridin-2-yl 365 Br H CH₂ 3,5-Dimethyl-4-thiomethyl-1-oxypyridin-2-yl 366 Br H CH₂ 6-Bromo-3,5-dimethyl-4-thiomethyl-pyridin-2-yl 367 Br H CH₂ 6-Chloro-3,5-dimethyl-4-thiomethyl-pyridin-2-yl 368 Br H CH₂ 6-Chloro-3,5-dimethyl-4-thiomethyl-1-oxypyridin-2-yl 369 Br H CH₂ 6-Bromo-3,5-dimethyl-4-thiomethyl-1-oxypyridin-2-yl 370 118 Br H CH₂ 3,4,5-Trimethyl-pyridin-2-yl 371 119 Br H CH₂ 3,4,5-Trimethyl-1-oxypyridin-2-yl 372 Br H CH₂ 6-Bromo-3,4,5-trimethyl-pyridin-2-yl 373 Br H CH₂ 6-Chloro-3,4,5-trimethyl-pyridin-2-yl 374 Br H CH₂ 6-Chloro-3,4,5-trimethyl-1-oxypyridin-2-yl 375 Br H CH₂ 6-Bromo-3,4,5-trimethyl-1-oxypyridin-2-yl 376 Br H CH₂ 3,4,5-Trimethoxy-pyridin-2-yl 377 Br H CH₂ 3,4,5-Trimethoxy-1-oxypyridin-2-yl 378 Br H CH₂ 6-Bromo-3,4,5-trimethoxy-pyridin-2-yl 379 Br H CH₂ 6-Chloro-3,4,5-trimethoxy-pyridin-2-yl 380 Br H CH₂ 6-Chloro-3,4,5-trimethoxy-1-oxypyridin-2-yl 381 Br H CH₂ 6-Bromo-3,4,5-trimethoxy-1-oxypyridin-2-yl 382 Br H CH₂ 4,5,6-Trimethoxypyridin-2-yl 383 Br H CH₂ 4,5,6-Trimethoxy-1-oxypyridin-2-yl 384 Br H CH₂ 3-Bromo-4,5,6-trimethoxypyridin-2-yl 385 Br H CH₂ 3-Chloro-4,5,6-trimethoxypyridin-2-yl 386 Br H CH₂ 3-Chloro-4,5,6-trimethoxy-1-oxypyridin-2-yl 387 Br H CH₂ 3-Bromo-4,5,6-trimethoxy-1-oxypyridin-2-yl 388 Br H CH₂ 4,5,6-Trimethoxypyridin-2-yl 389 Br H CH₂ 4,5,6-Trimethoxy-1-oxypyridin-2-yl 390 Br H CH₂ 3-Bromo-4,5,6-trimethyl-pyridin-2-yl 391 Br H CH₂ 3-Chloro-4,5,6-trimethyl-pyridin-2-yl 392 Br H CH₂ 3-Chloro-4,5,6-trimethyl-1-oxypyridin-2-yl 393 Br H CH₂ 3-Bromo-4,5,6-trimethyl-1-oxypyridin-2-yl 394 Br H CH₂ 4,6-Dimethyl-5-methoxy-pyridin-2-yl 395 Br H CH₂ 4,6-Dimethyl-5-methoxy-1-oxypyridin-2-yl 396 Br H CH₂ 3-Bromo-4,6-dimethyl-5-methoxy-pyridin-2-yl 397 Br H CH₂ 3-Chloro-4,6-dimethyl-5-methoxy-pyridin-2-yl 398 Br H CH₂ 3-Chloro-4,6-dimethyl-5-methoxy-1-oxypyridin-2-yl 399 Br H CH₂ 3-Bromo-4,6-dimethyl-5-methoxy-1-oxypyridin-2-yl 400 Br H CH₂ 4-Bromo-5,6-dimethoxy-pyridin-2-yl 401 Br H CH₂ 4-Bromo-5,6-dimethoxy-1-oxypyridin-2-yl 402 Br H CH₂ 3,4-Dibromo-5,6-dimethoxy-pyridin-2-yl 403 Br H CH₂ 3-Chloro-4-bromo-5,6-dimethoxy-pyridin-2-yl 404 Br H CH₂ 3-Chloro-4-bromo-5,6-dimethoxy-1-oxypyridin-2-yl 405 Br H CH₂ 3,4-Dibromo-5,6-dimethoxy-1-oxypyridin-2-yl 406 Br H CH₂ 4,6-Dimethyl-5-methoxypyridin-3-yl 407 Br H CH₂ 4,6-Dimethyl-5-methoxy-1-oxypyridin-3-yl 408 Br H CH₂ 4,6-Dimethyl-5-bromopyridin-3-yl 409 Br H CH₂ 4,6-Dimethyl-5-chloropyridin-3-yl 410 Br H CH₂ 5,6-Dimethyl-4-bromopyridin-3-yl 411 Br H CH₂ 5,6-Dimethyl-4-chloropyridin-3-yl 412 Br H CH₂ 4,6-Dimethyl-5-bromo-1-oxypyridin-pyridin-3-yl 413 Br H CH₂ 4,6-Dimethyl-5-chloro-1-oxypyridin-pyridin-3-yl 414 Br H CH₂ 5,6-Dimethyl-4-bromo-1-oxypyridin-pyridin-3-yl 415 Br H CH₂ 5,6-Dimethyl-4-chloro-1-oxypyridin-pyridin-3-yl 416 Br H CH₂ 2,6-Dimethyl-3-methoxypyridin-4-yl 417 Br H CH₂ 2,6-Dimethyl-pyridin-4-yl 418 Br H CH₂ 2,3,6-Trimethyl-pyridin-4-yl 419 Br H CH₂ 2,3,6-Trimethoxy-pyridin-4-yl 420 Br H CH₂ 2,6-Dimethyl-3-bromopyridin-4-yl 421 Br H CH₂ 2,6-Dimethyl-3-chloropyridin-4-yl 422 Br H CH₂ 2,6-Dichloro-3-bromopyridin-4-yl 423 Br H CH₂ 2,6-Dibromo-3-chloropyridin-4-yl 424 Br H CH₂ 2,3,6-Trichloro-pyridin-4-yl 425 Br H CH₂ 2,3,6-Tribromo-pyridin-4-yl 426 Br H CH₂ 2,6-Dimethyl-3-methoxy-1-oxy-pyridin-4-yl 427 Br H CH₂ 2,6-Dimethyl-1-oxy-pyridin-4-yl 428 Br H CH₂ 2,3,6-Trimethyl-1-oxypyridhi4yl 429 Br H CH₂ 2,3,6-Trimethoxy-1-oxy-pyridin-4-yl 430 Br H CH₂ 2,6-Dimethyl-3-bromo-1-oxy-pyridin-4-yl 431 Br H CH₂ 2,6-Dimethyl-3-chloro-1-oxy-pyridin-4-yl 432 Br H CH₂ 2,6-Dichloro-3-bromo-1-oxy-pyridin-4-yl 433 Br H CH₂ 2,6-Dibromo-3-chloro-1-oxy-pyridin-4-yl 434 Br H CH₂ 2,3,6-Trichloro-1-oxy-pyridin-4-yl 435 Br H CH₂ 2,3,6-Tribromo-1-oxy-pyridin-4-yl 436 Br H CH₂ 4,6-Dimethyl-5-iodopyridin-3-yl 437 Br H CH₂ 5,6-Dimethyl-4-iodopyridin-3-yl 438 Br H CH₂ 4,5,6-Trichloropyridin-3-yl 439 Br H CH₂ 4,5,6-Tribromopyridin-3-yl 440 F H CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 441 F H CH₂ 3,5-Dimethyl-4-methoxy-1-oxypyridin-2-yl 442 F H CH₂ 6-Bromo-3,5-dimethyl-4-methoxypyridin-2-yl 443 F H CH₂ 6-Chloro-3,5-dimethyl-4-methoxypyridin-2-yl 444 F H CH₂ 6-Chloro-3,5-dimethyl-4-methoxy-1-oxypyridin-2-yl 445 F H CH₂ 6-Bromo-3,5-dimethyl-4-methoxy-1-oxypyridin-2-yl 446 F H CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 447 F H CH₂ 3,5-Dimethyl-4-bromo-1-oxypyridin-2-yl 448 F H CH₂ 6-Bromo-3,5-dimethyl-4-bromopyridin-2-yl 449 F H CH₂ 6-Chloro-3,5-dimethyl-4-bromopyridin-2-yl 450 F H CH₂ 6-Chloro-3,5-dimethyl-4-bromo-1-oxypyridin-2-yl 451 F H CH₂ 4,6-Dibromo-3,5-dimethyl-1-oxypyridin-2-yl 452 F H CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 453 F H CH₂ 3,5-Dimethyl-4-chloro-1-oxypyridin-2-yl 454 F H CH₂ 6-Bromo-3,5-dimethyl-4-chloropyridin-2-yl 455 F H CH₂ 6-Chloro-3,5-dimethyl-4-chloropyridin-2-yl 456 F H CH₂ 4,6-Dichloro-3,5-dimethyl-1-oxypyridin-2-yl 457 F H CH₂ 6-Bromo-3,5-dimethyl-4-chloro-1-oxypyridin-2-yl 458 F H CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 459 F H CH 3,5-Dimethyl-4-iodo-1-oxypyridin-2-yl 460 F H CH₂ 6-Bromo-3,5-dimethyl-4-iodopyridin-2-yl 461 F H CH₂ 6-Chloro-3,5-dimethyl-4-iodopyridin-2-yl 462 F H CH₂ 6-Chloro-3,5-dimethyl-4-iodo-1-oxypyridin-2-yl 463 F H CH₂ 6-Bromo-3,5-dimethyl-4-iodo-1-oxypyridin-2-yl 464 F H CH₂ 3,5-Dimethyl-4-thiomethyl-pyridin-2-yl 465 F H CH₂ 3,5-Dimethyl-4-thiomethyl-1-oxypyridin-2-yl 466 F H CH₂ 6-Bromo-3,5-dimethyl-4-thiomethyl-pyridin-2-yl 467 F H CH₂ 6-Chloro-3,5-dimethyl-4-thiomethyl-pyridin-2-yl 468 F H CH₂ 6-Chloro-3,5-dimethyl-4-thiomethyl-1-oxypyridin-2-yl 469 F H CH₂ 6-Bromo-3,5-dimethyl-4-thiomethyl-1-oxypyridin-2-yl 470 F H CH₂ 3,4,5-Trimethyl-pyridin-2-yl 471 F H CH₂ 3,4,5-Trimethyl-1-oxypyridin-2-yl 472 F H CH₂ 6-Bromo-3,4,5-trimethyl-pyridin-2-yl 473 F H CH₂ 6-Chloro-3,4,5-trimethyl-pyridin-2-yl 474 F H CH₂ 6-Chloro-3,4,5-trimethyl-1-oxypyridin-2-yl 475 F H CH₂ 6-Bromo-3,4,5-trimethyl-1-oxypyridin-2-yl 476 F H CH₂ 3,4,5-Trimethoxy-pyridin-2-yl 477 F H CH₂ 3,4,5-Trimethoxy-1-oxypyridin-2-yl 478 F H CH₂ 6-Bromo-3,4,5-trimethoxy-pyridin-2-yl 479 F H CH₂ 6-Chloro-3,4,5-trimethoxy-pyridin-2-yl 480 F H CH₂ 6-Chloro-3,4,5-trimethoxy-1-oxypyridin-2-yl 481 F H CH₂ 6-Bromo-3,4,5-trimethoxy-1-oxypyridin-2-yl 482 F H CH₂ 4,5,6-Trimethoxy-pyridin-2-yl 483 F H CH₂ 4,5,6-Trimethoxy-1-oxypyridin-2-yl 484 F H CH₂ 3-Bromo-4,5,6-trimethoxy-pyridin-2-yl 485 F H CH₂ 3-Chloro-4,5,6-trimethoxy-pyridin-2-yl 486 F H CH₂ 3-Chloro-4,5,6-trimethoxy-1-oxypyridin-2-yl 487 F H CH₂ 3-Bromo-4,5,6-trimethoxy-1-oxypyridin-2-yl 488 F H CH₂ 4,5,6-Trimethyl-pyridin-2-yl 489 F H CH₂ 4,5,6-Trimethyl-1-oxypyridin-2-yl 490 F H CH₂ 3-Bromo-4,5,6-trimethyl-pyridin-2-yl 491 F H CH₂ 3-Chloro-4,5,6-trimethyl-pyridin-2-yl 492 F H CH₂ 3-Chloro-4,5,6-trimethyl-1-oxypyridin-2-yl 493 F H CH₂ 3-Bromo-4,5,6-trimethyl-1-oxypyridin-2-yl 494 F H CH₂ 4,6-Dimethyl-5-methoxy-pyridin-2-yl 495 F H CH₂ 4,6-Dimethyl-5-methoxy-1-oxypyridin-2-yl 496 F H CH₂ 3-Bromo-4,6-dimethyl-5-methoxy-pyridin-2-yl 497 F H CH₂ 3-Chloro-4,6-dimethyl-5-methoxy-pyridin-2-yl 498 F H CH₂ 3-Chloro-4,6-dimethyl-5-methoxy-1-oxypyridin-2-yl 499 F H CH₂ 3-Bromo-4,6-dimethyl-5-methoxy-1-oxypyridin-2-yl 500 F H CH₂ 4-Bromo-5,6-dimethoxy-pyridin-2-yl 501 F H CH₂ 4-Bromo-5,6-dimethoxy-1-oxypyridin-2-yl 502 F H CH₂ 3,4-Dibromo-5,6-dimethoxy-pyridin-2-yl 503 F H CH₂ 3-Chloro-4-bromo-5,6-dimethoxy-pyridin-2-yl 504 F H CH₂ 3-Chloro-4-bromo-5,6-dimethoxy-1-oxypyridin-2-yl 505 F H CH₂ 3,4-Dibromo-5,6-dimethoxy-1-oxypyridin-2-yl 506 F H CH₂ 4,6-Dimethyl-5-methoxypyridin-3-yl 507 F H CH₂ 4,6-Dimethyl-5-methoxy-1-oxypyridin-3-yl 508 F H CH₂ 4,6-Dimethyl-5-bromopyridin-3-yl 509 F H CH₂ 4,6-Dimethyl-5-chloropyridin-3-yl 510 F H CH₂ 5,6-Dimethyl-4-bromopyridin-3-yl 511 F H CH₂ 5,6-Dimethyl-4-chloropyridin-3-yl 512 F H CH₂ 4,6-Dimethyl-5-bromo-1-oxypyridin-pyridin-3-yl 513 F H CH₂ 4,6-Dimethyl-5-chloro-1-oxypyridin-pyridin-3-yl 514 F H CH₂ 5,6-Dimethyl-4-bromo-1-oxypyridin-pyridin-3-yl 515 F H CH₂ 5,6-Dimethyl-4-chloro-1-oxypyridin-pyridin-3-yl 516 F H CH₂ 2,6-Dimethyl-3-methoxypyridin-4-yl 517 F H CH₂ 2,6-Dimethyl-pyridin-4-yl 518 F H CH₂ 2,3,6-Trimethyl-pyridin-4-yl 519 F H CH₂ 2,3,6-Trimethoxy-pyridin-4-yl 520 F H CH₂ 2,6-Dimethyl-3-bromopyridin-4-yl 521 F H CH₂ 2,6-Dimethyl-3-chloropyridin-4-yl 522 F H CH₂ 2,6-Dichloro-3-bromopyridin-4-yl 523 F H CH₂ 2,6-Dibromo-3-chloropyridin-4-yl 524 F H CH₂ 2,3,6-Trichloro-pyridin-4-yl 525 F H CH₂ 2,3,6-Tribromo-pyridin-4-yl 526 F H CH₂ 2,6-Dimethyl-3-methoxy-1-oxy-pyridin-4-yl 527 F H CH₂ 2,6-Dimethyl-1-oxy-pyridin-4-yl 528 F H CH₂ 2,3,6-Trimethyl-1-oxy-pyridin-4-yl 529 F H CH₂ 2,3,6-Trimethoxy-1-oxy-pyridin-4-yl 530 F H CH₂ 2,6-Dimethyl-3-bromol-oxy-pyridin-4-yl 531 F H CH₂ 2,6-Dimethyl-3-chlorol-oxy-pyridin-4-yl 532 F H CH₂ 2,6-Dichloro-3-bromol-oxy-pyridin-4-yl 533 F H CH₂ 2,6-Dibromo-3-chlorol-oxy-pyridin-4-yl 534 F H CH₂ 2,3,6-Trichloro-1-oxy-pyridin-4-yl 536 F H CH₂ 2,3,6-Tribromo-1-oxy-pyridin-4-yl 537 F H CH₂ 4,6-Dimethyl-5-iodopyridin-3-yl 538 F H CH₂ 5,6-Dimethyl-4-iodopyridin-3-yl 539 F H CH₂ 4,5,6-Trichloropyridin-3-yl 540 Cl Cl CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 541 Br Cl CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 542 Cl Br CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 543 Br Br CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 544 Cl N₃ CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 545 Br N₃ CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 546 F Cl CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 547 F Br CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 548 Cl CN CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 549 Br CN CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 550 Cl Cl CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 551 Br Cl CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 552 Cl Br CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 553 Br Br CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 554 Cl N₃ CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 555 Br N₃ CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 556 F Cl CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 557 F Br CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 558 Cl CN CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 559 Br CN CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 560 Cl Cl CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 561 Br Cl CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 562 Cl Br CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 563 Br Br CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 564 Cl N₃ CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 565 Br N₃ CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 566 F Cl CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 567 F Br CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 568 Cl CN CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 569 Br CN CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 570 Cl Cl CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 571 Br Cl CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 572 Cl Br CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 573 Br Br CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 574 Cl N₃ CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 575 Br N₃ CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 576 F Cl CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 577 F Br CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 578 Cl CN CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 579 Br CN CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl 580 Cl Cl CH₂ 4,5,6-Trimethoxy-3-chloropyridin-2-yl 581 Br Cl CH₂ 4,5,6-Trimethoxy-3-chloropyridin-2-yl 582 Cl Br CH₂ 4,5,6-Trimethoxy-3-chloropyridin-2-yl 583 Br Br CH₂ 4,5,6-Trimethoxy-3-chloropyridin-2-yl 584 Cl Cl CH₂ 4,5,6-Trimethoxy-3-bromopyridin-2-yl 585 Br Cl CH₂ 4,5,6-Trimethoxy-3-bromopyridin-2-yl 586 Cl Br CH₂ 4,5,6-Trimethoxy-3-bromopyridin-2-yl 587 Br Br CH₂ 4,5,6-Trimethoxy-3-bromopyridin-2-yl 588 7 Cl H CH₂ 3,5-Dimethyl-4-hydroxypyridin-2-yl 589 8 Cl H CH₂ 3,5-Dimethyl-4-ethoxypyridin-2-yl 590 9 Cl H CH₂ 3,5-Dimethyl-4-allyloxypyridin-2-yl 591 10 Cl H CH₂ 3,5-Dimethyl-4-(2-ethoxy-ethoxy)pyridin-2-yl 592 11 Cl H CH₂ 3,5-Dimethyl-4isopropoxypyridin-2-yl 593 12 Cl H CH₂ 3,5-Dimethyl-4-cyclopropylmethoxypyridin-2-yl 594 13 Cl H CH₂ 3,5-Dimethyl-4-(3-methyl-butoxy)pyridin-2-yl 595 14 Cl H CH₂ 3,5-Dimethyl-4-isobutoxypyridin-2-yl 596 15 Cl H CH₂ 3,5-Dimethyl-4-(2-acetyloxy-ethoxy)pyridin-2-yl 597 16 Cl H CH₂ 3,5-Dimethyl-4-(3-acetyloxy-propoxy)pyridin-2-yl 598 17 Cl H CH₂ 3,5-Dimethyl-4-propoxypyridin-2-yl 599 20 Cl H CH₂ 3,5-Dimethylpyridin-2-yl 600 32 Cl H CH₂ 3,5-Dimethyl-4-methoxy-1-methoxypyridin-2-yl 601 34 Cl H CH₂ 5-Methoxy-4-methoxymethyl-6-methylpyridin-3-yl 602 35 Cl H CH₂ 5-Ethoxy-4-hydroxymethyl-6-methylpyridin-3-yl 604 36 Cl H CH₂ 3,5-Dimethyl-4-aminopyridin-2-yl 605 37 Cl H CH₂ 3-Methoxy-5-methoxymethyl-4-methylpyridin-2-yl 606 38 Cl H CH₂ 5-Chloro-6-methoxypyridin-3-yl 607 39 Cl H CH₂ 3,4-Dimethoxypyridin-2-yl 608 40 Cl H CH₂ 3-Methoxy-6-methylpyridin-2-yl 609 42 H H CH₂ 4-Methoxy-3,5-dimethylpyridin-2-yl 610 45 Cl Br CH₂ 2-Bromo-3,5-dimethoxy-4-methylphenyl 611 47 Cl Bu CH₂ 3,4,5-Trimethoxyphenyl 612 49 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-acetyloxyphenyl 613 50 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-hydroxyphenyl 614 52 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-allyloxyphenyl 615 53 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-chloromethyloxyphenyl 616 54 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-chloroethyloxyphenyl 617 55 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-cyclopropylmethoxyphenyl 618 56 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-ethoxyphenyl 619 57 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-propoxyphenyl 620 58 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-butoxyphenyl 621 59 Cl H CH₂ 3-Methoxymethyloxy-6-imethylpyridin-2-yl 622 60 Cl H CH₂ 3H-Benzothiazole-2-thione 623 61 Cl H CH₂ 2,5-Dimethylphenyl 624 62 Cl H CH₂ Isoquinolin-1-yl 625 63 Cl H CH₂ Benzo[1,2,5]thiadiazol-5-yl 626 64 Cl H CH₂ 1-Methyl-1H-benzotriazol-5-yl 627 65 Cl H CH₂ 6-Chloro-benzo[1,2,5]thiadiazol-5-yl 628 66 Cl H CH₂ Benzo[1,2,5]thiadiazol-4-yl 629 67 Cl H CH₂ 6-Fluoro-4a,8a-dihydro-4H-benzo[1,3]dioxin-8-yl 630 68 Cl H CH₂ 2-Methoxy-4-acetylphenyl 631 69 Cl H CH₂ 3-Trifluoromethoxyphenyl 632 70 Cl H CH₂ 2-Fluoro-3-trifluoromethylphenyl 633 71 Cl H CH₂ 2-Fluoro-4,5-dimethoxyphenyl 634 72 Cl H CH₂ 2,3-Dimethoxyphenyl 635 73 Cl H CH₂ 3,4-Dimethoxyphenyl 636 74 Me H CH₂ 2-Chloro-3,4,5-trimethoxyphenyl 637 75 Cl H CH₂ 2-Chloro-4,5-dimethoxyphenyl 638 76 Cl H CH₂ 2-Iodo-4,5-dimethoxyphenyl 639 78 Cl H CH₂ 6-Chloro-benzo[1,3]dioxol-5-yl 640 79 Cl H CH₂ 2,4-Dimethoxy-3-methylphenyl 641 80 Cl H CH₂ 2-Chloro-3,4-dimethoxyphenyl 642 81 Cl H CH₂ 3-Methoxyphenyl 643 82 Cl H CH₂ 2,6-Dibromo-3,5-dimethoxyphenyl 644 83 Cl H CH₂ 2-Bromo-3,5-dimethoxyphenyl 645 84 Cl H CH₂ 3,5-Dimethoxyphenyl 646 86 Cl H CH₂ 2,5-Dimethoxyphenyl 647 87 Cl Br CH₂ 2,5-Dimethoxyphenyl 648 88 Cl H CH₂ 2-Nitro-4,5-dimethoxyphenyl 649 89 Cl Br CH₂ 2-Nitro-4,5-dimethoxyphenyl 650 90 Cl H CH₂ 2,5-Dichlorophenyl 651 91 Cl H CH₂ 2,3,5-Trifluorophenyl 652 92 Cl H C(O) 3,4,5-Trimethoxyphenyl 653 95 Cl H CH₂ 3,5-Dichlorophenyl 654 96 Cl H CH₂ 3,4-Dichlorophenyl 655 97 Cl Br CH₂ 3,4-Dichlorophenyl 656 99 Cl H CH₂ 2,6-Dichloro-3,4,5-trimethoxyphenyl 657 100 OH H CH₂ 2-Chloro-3,4,5-trimethoxyphenyl 658 103 SEt H CH₂ 2-Bromo-3,4,5-trimethoxyphenyl 659 104 OMe H CH₂ 2-Bromo-3,4,5-trimethoxyphenyl 660 105 NH₂ H CH₂ 2-Bromo-3,4,5-trimethoxyphenyl 661 107 Cl H CH₂ 2-Bromo-3,5-dimethoxy-4-methoxymethyloxyphenyl 662 108 Cl H CH₂ Benzothiazol-2-yl 663 109 Cl H CH₂ 4-Methoxyphenyl 664 110 Cl H CH₂ 2-Bromo-4,5-dimethoxyphenyl 665 112 Cl H CH₂ 4-Methylquinolin-2-yl 666 113 Br H CH₂ 4-Methylquinolin-2-yl 667 114 Br H CH₂ 4-Methyl-1-oxy-quinolin-2-yl 668 116 Cl H CH₂ 6-Chloro-benzothiazol-2-yl 669 Cl H CH₂ 4,5,6-Trimethoxy-pyridin-3-yl 670 Cl H CH₂ 4,5,6-Trimethoxy-1-oxy-pyridin-3-yl 671 Cl H CH₂ 2-Bromo-4,5,6-trimethoxy-pyridin-3-yl 672 Cl H CH₂ 2-Chloro-4,5,6-trimethoxy-pyridin-3-yl 673 Cl H CH₂ 2-Chloro-4,5,6-trimethoxy-1-oxy-pyridin-3-yl 674 Cl H CH₂ 2-Bromo-4,5,6-trimethoxy-1-oxy-pyridin-3-yl 675 Cl H CH₂ 4,5,6-Trimethyl-pyridin-3-y1 676 Cl H CH₂ 4,5,6-Trimethyl-1-oxy-pyridin-3-yl 677 Cl H CH₂ 2-Bromo-4,5,6-trimethyl-pyridin-3-yl 678 Cl H CH₂ 2-Chloro-4,5,6-trimethyl-pyridin-3-yl 679 Cl H CH₂ 2-Chloro-4,5,6-trimethyl-1-oxy-pyridin-3-yl 680 Cl H CH₂ 2-Bromo-4,5,6-trimethyl-1-oxy-pyridin-3-yl 681 Cl H CH₂ 2-Iodo-4,5,6-trimethyl-pyridin-3-yl 682 Cl H CH₂ 2-Iodo-4,5,6-trimethyl-pyridin-3-yl 683 Br H CH₂ 4,5,6-Trimethoxy-pyridin-3-yl 684 Br H CH₂ 4,5,6-Trimethoxy-1-oxy-pyridin-3-yl 685 Br H CH₂ 2-Bromo-4,5,6-trimethoxy-pyridin-3-yl 686 Br H CH₂ 2-Chloro-4,5,6-trimethoxy-pyridin-3-yl 687 Br H CH₂ 2-Chloro-4,5,6-trimethoxy-1-oxy-pyridin-3-yl 688 Br H CH₂ 2-Bromo-4,5,6-trimethoxy-1-oxy-pyridin-3-yl 689 Br H CH₂ 4,5,6-Trimethyl-pyridin-3-yl 690 Br H CH₂ 4,5,6-Trimethyl-1-oxy-pyridin-3-yl 691 Br H CH₂ 2-Bromo-4,5,6-trimethyl-pyridin-3-yl 692 Br H CH₂ 2-Chloro-4,5,6-trimethyl-pyridin-3-yl 693 Br H CH₂ 2-Chloro-4,5,6-trimethyl-1-oxy-pyridin-3-yl 694 Br H CH₂ 2-Bromo-4,5,6-trimethyl-1-oxy-pyridin-3-yl 695 I H CH₂ 3,5-Dimethyl-4-methoxypyridin-2-yl 696 I H CH₂ 3,5-Dimethyl-4-methoxy-1-oxypyridin-2-yl 697 I H CH₂ 3-Bromo-4,5,6-trimethoxypyridin-2-yl 698 I H CH₂ 4,5,6-Trimethoxypyridin-2-yl 699 I H CH₂ 6-Chloro-3,5-dimethyl-4-methoxy-pyridin-2-yl 700 I H CH₂ 3,5-dimethyl-4-thiomethyl-1-oxypyridin-2-yl 701 I H CH₂ 3,5-Dimethyl-4-bromopyridin-2-yl 702 I H CH₂ 3,5-Dimethyl-4-bromo-1-oxypyridin-2-yl 703 I H CH₂ 3-Chloro-4,5,6-trimethoxypyridin-2-yl 704 I H CH₂ 3,4,5-Trimethoxyphenyl 705 I H CH₂ 2-Chloro-3,4,5-trimethoxyphenyl 706 I H CH₂ 2-Bromo-3,4,5-trimethoxyphenyl 707 I H CH₂ 2-Iodo-3,4,5-trimethoxyphenyl 708 I H CH₂ 3,4,5-Trimethylpyridin-2-yl 709 I H CH₂ 4,5,6-Trimethylpyridin-3-yl 710 I H CH₂ 3,5-dimethyl-4-thiomethylpyridin-2-yl 711 I H CH₂ 4,6-Dimethyl-5-methoxypyridin-3-yl 712 I H CH₂ 4,6-Dimethyl-5-methoxy-1-oxypyridin-3-yl 713 I H CH₂ 3,5-Dimethyl-4-chloropyridin-2-yl 714 I H CH₂ 3,5-Dimethyl-4-iodopyridin-2-yl Compounds of interest in Table 1 are compounds 2, 3, 11, 44, 82, 83, 242, 243, 245, 248, 249, 254, 255, 260, 266, 272, 273, 278, 279, 284, 286, 287, 308, 309, 343, 348, 349, 354, 366, 367, 372, 373, 671 and 697 with those selected being 2, 242, 243, 248, 254, 260, 266, 272, 278, 284, 286, 287, 308, 343, 348, 349, 354, 372, 373, 671 and 697.

III. Synthesis of the Compounds of the Invention

Synthesis of compounds of the present invention may be accomplished by various methods known in the art, including those described in, for example, Montgomery, J. Med. Pharm. Chem., 1962, 5, 15–24; Sircar, U.S. Pat. No. 4,772,606 (1988); Sircar, U.S. Pat. No. 4,748,177 (1988); Hans, U.S. Pat. No. 5,110,818 (1992); Gillespie, WO 02/055521; Matsuda, JP 10025294 A2, (1998). For the synthesis of compounds of Formulae I and II, a general strategy is outlined in Scheme 1. It should be understood that other methods can also be used.

The starting materials or the intermediates of the Formula 2, or/and 4 can exist in tautomeric forms as shown in FIG. 1. Both forms are indiscriminately described in the specifications.

Method 1: From Purines:

The compounds of Formula I (see, Scheme 2) can be synthesized from the commercially available starting heterocycle, for example compounds of Formula 2 where R⁶ is —Cl, —Br or —OH, R⁷ is —NH₂ and R⁸ is —H are commercially available from Aldrich, AlfaAesar, etc. Accordingly, Formula 2 can be alkylated in the presence of a base such as K₂CO₃, NaH, Cs₂CO₃, DBU etc. with/without the presence of halide such as NaI, KI, (Bu)₃NI etc., and in a polar solvent such as DMF, THF, DMSO etc. using electrophiles such as L¹-R⁴—R⁵ where -L¹ is a leaving group. Leaving groups include but are not limited to, e.g., halogen, triflate, tosylate, mesylate etc.

(See Kasibhatla, WO 03/037860) Compounds of Formula I, wherein R¹ is —OH can be converted to halides using standard conditions POCl₃, POBr³ etc. with/without the presence of base such as Et₃N, N,N-diethylaniline, (i-Pr)₂NEt etc. in polar solvents such as CH₃CN, CH₂Cl₂ etc.

The compounds of Formula I wherein R¹ is —OR¹¹, —SR¹¹, or —NHR⁸, where R¹¹ is alkyl, R⁸ is hydrogen, lower alkyl, lower aryl, or —C(O)R⁹, where R⁹ is lower alkyl, lower aryl, lower heteroaryl, —NR¹⁰R¹⁰, or —OR¹¹, where R¹⁰ is independently hydrogen or lower alkyl, can be prepared from compounds of Formula I wherein R¹ is halogen by reacting with HOR¹¹, HSR¹¹ or NH₂R⁸ in presence of a base such as K₂CO₃ or NaH and a polar solvent such as DMF or THF. Compounds of Formula I where R⁸ is —C(O)R⁹ can be prepared when R¹ is hydroxyl by simple acylation.

Compounds of Formula I where R¹ is alkyl can be prepared from compounds of Formula I where R¹ is halogen and trialkyl aluminum or dialkyl zinc. See Holy, J. Med. Chem. 1999, 42, 2064.

R⁵ especially when it is aryl or heteroaryl, can be further modified as needed, for example by halogenation, nitration, palladium coupling of halogen, Friedel-Crafts alkylation/acylation, etc. or these modifications can also be done before alkylation, see Jerry March, Advanced Organic Chemistry. The heteroaromatic rings can also be oxidized to their corresponding N-oxides using various oxidizing agents such as H₂O₂, O₃, MCPBA etc. in polar solvents such as CH₂Cl₂, CHCl₃, CF₃COOH etc. See Jerry March, Advanced Organic Chemistry, 4th edition, Chapter 19.

Compounds of Formula I where R³ is halogen, can be prepared from Formulae 1 or 2 using halogenating agents such as Br₂, NBS, NCS, NIS etc. in polar solvents such as DMF, water, or suitable buffer solution. See Herdewijn, J. Med. Chem. 1995, 38, 3838. Alternatively, compounds of Formula 2 where R⁸ is iodo can also be made using procedures known in the literature, e.g., Burger, J. Org. Chem. 2000, 65, 7825. These can be further modified as needed; for example, where R³ is —N₃, or —CN by reacting with an azide such as NaN₃, LiN₃ etc. or cynide such as KCN or NaCN in polar solvents such as DMF, DMSO etc. See Halbfinger, J. Med. Chem. 1999, 42, 1625; Jacobson, J. Med. Chem. 1999, 42, 5325.

Method 2: From Pyrimidines:

Compounds of Formula I can also be prepared from the substituted pyrimidines of Formula 5 (see, Scheme 3). Accordingly, reaction of commercially available compounds of Formula 5, where R¹⁶ is hydrogen or —NO₂, (see J. Chem. Soc. 1962, 4186, for the preparation of R¹⁶═—NO₂ compound) with NH₂—R⁴—R⁵ in solvents such as EtOH, BuOH etc. in the presence of organic

bases such as Et₃N, (i-Pr)₂NEt etc. followed by nitrosation (when R¹⁶═—H) using nitrous acid, then reduction with sodium dithionite or Zn/HCOOH etc. of Formula 6 (R¹⁶═—NO or —NO₂) to yield compounds of Formula 6 where R¹⁶ is —NH₂. Condensation of Formula 6, where R¹⁶ is —NH₂ using standard conditions such as triethylorthoformate, formic acid, cyanogenbromide etc. as described in J. Chem. Soc. 1963, 4186; Sircar, U.S. Pat. No. 4,748,177, 1988; and Dang, WO 98/39344, followed by reaction with POCl₃ to give compounds of Formula I, Scheme 3. These compounds of Formula I can be further modified as necessary.

Similarly, compounds of Formula I can also be synthesized from Formula 7, 2-amino-4,6-dichloro pyrimidine (see Scheme 4). Reaction of Formula 7 with NH₂—R⁴—R⁵ in solvents such as EtOH, BuOH etc. in presence of organic bases such as Et₃N, (i-Pr)₂NEt, etc. followed by reaction with diazonium salt prepared from 4-chloroaniline

and NaNO₂ in aq. HCl to give compound Formula of 8, where R¹⁶ is azo-(4-chlorobenzene). Reduction of the azo compound with zinc in acetic acid to give compounds of Formula 8, where R¹⁶ is —NH₂, see, Meier, U.S. Pat. No. 5,204,353, 1993. Condensation of these compounds using standard conditions such as triethylorthoformate, formic acid, cyanogenbromide etc. as described in J. Chem. Soc. 1963, 4186; Sircar, U.S. Pat. No. 4,748,177, 1988, and Dang, WO 98/39344, followed by reaction with POCl₃ to give compounds of Formula I, Scheme 4. These compounds of Formula I can be further modified as necessary.

Likewise compounds of Formula 8 where R¹⁶ is NH₂ can be made from the commercially available 2,5-diamino-4,6-dihydroxy pyrimidine as described in Daluge, U.S. Pat. No. 5,917,042, 1999 (see Scheme 5).

Method 3: From Imidazoles:

Compounds of Formula I can also be prepared from the substituted imidazoles as shown in Scheme 6. Accordingly, compounds of Formula 4, wherein R¹⁴ is NH₂, R¹³ is C(O)NH₂ and R³ is H, can be alkylated in the presence of a base such as KOH, NaOH, K₂CO₃, NaH, Cs₂CO₃, DBU etc. with/without the presence of halide such as NaI, KI, (Bu)₃NI etc., and in a polar solvent such as DMF, THF, DMSO etc. using electrophiles such as L₁-R⁴—R⁵ where L₁ is a leaving group. Leaving groups include but are not limited to, e.g., halogen, triflate, tosylate, mesylate etc. to give compounds of Formula 10. The ring closure can be achieved using many methods reported in the literature, Alhede, J. Org. Chem., 1991, 2139 and references cited therein to give guanines of Formula I, wherein R¹ is OH. These compounds can be converted to the

compounds of Formula I, wherein R¹ is CI using POCl₃ as described earlier. Advantageously, these steps can be reversed as shown in Scheme 6 via Formula 11. Alternately, we can also construct these 2-aminopyrimidine rings from Formula 4, wherein R¹⁴ is —OH or halide, R¹³ is —C(O)OEt and R¹⁵ is —H by reacting with guanidine hydrochloride as described in Chowdhury, J. Med. Chem. 1999, 42, 4300. Preparation of electrophiles L¹-R⁴—R⁵ wherein L, is a leaving group and of nucleophiles NH₂—R⁴—R⁵ Synthesis of benzyl Type electrophile:

The electrophiles can be prepared from the substituted benzene derivatives using various methods reported in the literature, see Jerry March, Advanced Organic Chemistry, 4^(th) edition; Larock, Comprehensive Organic Transformations, 1989, VCH, New York. For example the L₁ is —Br can be prepared by reduction followed by halogenation of the benzoic acid or aldehyde derivatives. These benzyl derivatives can also be prepared by benzylic oxidation or benzylic halogenation. Further modification of the benzyl ring can be done before or after the purine alkylation step, for example the halogenation was done in both ways. The corresponding amines where L¹ is —NH₂ can be prepared from the compounds where L¹ is leaving group such as chloride, bromide, tosylate, mesylate etc. using ammonia.

Synthesis of pyridyl methyl Type electrophile:

These compounds can be prepared from many methods reported in the literature. Morisawa et al. J. Med. Chem. 1974, 17, 1083; Klaus, W. et al. J. Med. Chem. 1992, 35, 438; Abramovitch, R. A.; Smith, E. M. “Pyridine-1-oxide in Pyridine and its Derivatives” in The Chemistry of Heterocyclic Compounds; Weissberger, A., Taylor, E. C., Eds.; John Wieley, New York, 1974, Pt. 2, pp 1–261; Jeromin, G. E. et al. Chem. Ber. 1987, 120, 649. Blanz, E. J., et al. J. Med. Chem. 1970, 13, 1124; Smith, Kline and French, EP 0184322, 1986; Abblard, J. et al. Bull. Soc. Chim. Fr. 1972, 2466; Fisher, B. E. et al. “The Structure of Isomaltol” J. Org. Chem. 1964, 29, 776. De Cat, A. et al. Bull. Soc. Chim. Belg. 1965, 74, 270; Looker, J. H. et al. J. Org. Chem. 1979, 44, 3407. Ackerman, J. F. Ph.D. Dissertation, University of Notre Dame, June, 1949. These methods can be applied to the synthesis of quinoline and isoquinolines type compounds.

Further modification of the pyridyl ring can be done after the purine alkylation see Scheme 7.

IV. Pharmaceutical Compositions, Dosing, and Modes of Administration

The present invention is directed to the clinical use of the heterocyclics, in particular, 2-aminopurine and related analogs of Formulae A, I and II, and their polymorphs, solvates, esters, tautomers, enantiomers, diastereomers, pharmaceutically acceptable salts and prodrugs thereof, for use in treatment or prevention of diseases that are HSP90-dependent. For example, a disorder such as inflammatory diseases, infections, autoimmune disorders, stroke, ischemia, cardiac disorders, neurological disorders, fibrogenetic disorders, proliferative disorders, tumors, leukemias, neoplasms, cancers, carcinomas, metabolic diseases, and malignant disease. The fibrogenetic disorders include but are not limited to scleroderma, polymyositis, systemic lupus, rheumatoid arthritis, liver cirrhosis, keloid formation, interstitial nephritis and pulmonary fibrosis.

The present invention features pharmaceutical compositions comprising the compound of Formulae A, I and II, or a polymorph, solvate, ester, tautomer, pharmaceutically acceptable salt thereof, or prodrug thereof, of any of the preceding aspect and embodiments and one or more pharmaceutical excipients.

Those of ordinary skill in the art are familiar with formulation and administration techniques that can be employed with the compounds and methods of the invention, e.g., as discussed in Goodman and Gilman, The Pharmacological Basis of Therapeutics, current ed.; Pergamon; and Remington's, Pharmaceutical Sciences (current edition), Mack Publishing Co., Easton, Pa.

The compounds utilized in the methods of the instant invention may be administered either alone or in combination with pharmaceutically acceptable carriers, excipients or diluents, in a pharmaceutical composition, according to standard pharmaceutical practice. The compounds can be administered orally or parenterally, including the intravenous, intramuscular, intraperitoneal, subcutaneous, rectal and topical routes of administration.

For example, the therapeutic or pharmaceutical compositions of the invention can be administered locally to the area in need of treatment. This may be achieved by, for example, but not limited to, local infusion during surgery, topical application, e.g., cream, ointment, injection, catheter, or implant, said implant made, e.g., out of a porous, non-porous, or gelatinous material, including membranes, such as sialastic membranes, or fibers. The administration can also be by direct injection at the site (or former site) of a tumor or neoplastic or pre-neoplastic tissue.

Still further, the compounds or compositions of the invention can be delivered in a vesicle, e.g., a liposome (see, for example, Langer, Science 1990, 249, 1527–1533; Treat et al., Liposomes in the Therapy of Infectious Disease and Cancer, Lopez-Bernstein and Fidler, Ed., Liss, N.Y., pp. 353–365, 1989).

The compounds and pharmaceutical compositions used in the methods of the present invention can also be delivered in a controlled release system. In one embodiment, a pump may be used (see, Sefton, 1987; CRC Crit. Ref. Biomed. Eng. 14:201; Buchwald et al. Surgery, 1980 88, 507; Saudek et al. N. Engl. J. Med. 1989, 321, (574). Additionally, a controlled release system can be placed in proximity of the therapeutic target. (See, Goodson, Medical Applications of Controlled Release, 1984, Vol. 2, pp. 115–138).

The pharmaceutical compositions used in the methods of the instant invention can also contain the active ingredient in a form suitable for oral use, for example, as tablets, troches, lozenges, aqueous or oily suspensions, dispersible powders or granules, emulsions, hard or soft capsules, or syrups or elixirs. Compositions intended for oral use may be prepared according to any method known to the art for the manufacture of pharmaceutical compositions, and such compositions may contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide pharmaceutically elegant and palatable preparations. Tablets contain the active ingredient in admixture with non-toxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients may be, for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, such as microcrystalline cellulose, sodium crosscarmellose, cornstarch, or alginic acid; binding agents, for example starch, gelatin, polyvinyl-pyrrolidone or acacia, and lubricating agents, for example, magnesium stearate, stearic acid or talc. The tablets may be un-coated or coated by known techniques to mask the taste of the drug or delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a water soluble taste masking material such as hydroxypropylmethyl-cellulose or hydroxypropylcellulose, or a time delay material such as ethyl cellulose, or cellulose acetate butyrate may be employed as appropriate.

Formulations for oral use may also be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water soluble carrier such as polyethyleneglycol or an oil medium, for example peanut oil, liquid paraffin, or olive oil.

Aqueous suspensions contain the active material in admixture with excipients suitable for the manufacture of aqueous suspensions. Such excipients are suspending agents, for example sodium carboxymethylcellulose, methylcellulose, hydroxypropylmethyl-cellulose, sodium alginate, polyvinyl-pyrrolidone, gum tragacanth and gum acacia; dispersing or wetting agents may be a naturally-occurring phosphatide, for example lecithin, or condensation products of an alkylene oxide with fatty acids, for example polyoxyethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, for example heptadecaethylene-oxycetanol, or condensation products of ethylene oxide with partial esters derived from fatty acids and a hexitol such as polyoxyethylene sorbitol monooleate, or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol anhydrides, for example polyethylene sorbitan monooleate. The aqueous suspensions may also contain one or more preservatives, for example ethyl, or n-propyl p-hydroxybenzoate, one or more coloring agents, one or more flavoring agents, and one or more sweetening agents, such as sucrose, saccharin or aspartame.

Oily suspensions may be formulated by suspending the active ingredient in a vegetable oil, for example arachis oil, olive oil, sesame oil or coconut oil, or in mineral oil such as liquid paraffin. The oily suspensions may contain a thickening agent, for example beeswax, hard paraffin or cetyl alcohol. Sweetening agents such as those set forth above, and flavoring agents may be added to provide a palatable oral preparation. These compositions may be preserved by the addition of an anti-oxidant such as butylated hydroxyanisol or alpha-tocopherol.

Dispersible powders and granules suitable for preparation of an aqueous suspension by the addition of water provide the active ingredient in admixture with a dispersing or wetting agent, suspending agent and one or more preservatives. Suitable dispersing or wetting agents and suspending agents are exemplified by those already mentioned above. Additional excipients, for example sweetening, flavoring and coloring agents, may also be present. These compositions may be preserved by the addition of an anti-oxidant such as ascorbic acid.

The compounds and pharmaceutical compositions used in the methods of the instant invention may also be in the form of an oil-in-water emulsions. The oily phase may be a vegetable oil, for example olive oil or arachis oil, or a mineral oil, for example liquid paraffin or mixtures of these. Suitable emulsifying agents may be naturally-occurring phosphatides, for example soy bean lecithin, and esters or partial esters derived from fatty acids and hexitol anhydrides, for example sorbitan monooleate, and condensation products of the said partial esters with ethylene oxide, for example polyoxyethylene sorbitan monooleate. The emulsions may also contain sweetening agents, flavoring agents, preservatives and antioxidants.

Syrups and elixirs may be formulated with sweetening agents, for example glycerol, propylene glycol, sorbitol or sucrose. Such formulations may also contain a demulcent, a preservative, flavoring and coloring agents and antioxidant.

The pharmaceutical compositions may be in the form of a sterile injectable aqueous solution. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution.

The sterile injectable preparation may also be a sterile injectable oil-in-water microemulsion where the active ingredient is dissolved in the oily phase. For example, the active ingredient may, be first dissolved in a mixture of soybean oil and lecithin. The oil solution then introduced into a water and glycerol mixture and processed to form a microemulsion.

The injectable solutions or microemulsions may be introduced into a patient's blood-stream by local bolus injection. Alternatively, it may be advantageous to administer the solution or microemulsion in such a way as to maintain a constant circulating concentration of the instant compound. In order to maintain such a constant concentration, a continuous intravenous delivery device may be utilized. An example of such a device is the Deltec CADD-PLUS™ model 5400 intravenous pump.

The pharmaceutical compositions may be in the form of a sterile injectable aqueous or oleagenous suspension for intramuscular and subcutaneous administration. This suspension may be formulated according to the known art using those suitable dispersing or wetting agents and suspending agents which have been mentioned above. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally-acceptable diluent or solvent, for example as a solution in 1,3-butane diol. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose any bland fixed oil may be employed including synthetic mono- or diglycerides. In addition, fatty acids such as oleic acid find use in the preparation of injectables.

The compounds of the present invention used in the methods of the present invention may also be administered in the form of suppositories for rectal administration of the drug. These compositions can be prepared by mixing the inhibitors with a suitable non-irritating excipient which is solid at ordinary temperatures but liquid at the rectal temperature and will therefore melt in the rectum to release the drug. Such materials include cocoa butter, glycerinated gelatin, hydrogenated vegetable oils, mixtures of polyethylene glycols of various molecular weights and fatty acid esters of polyethylene glycol.

For topical use, creams, ointments, jellies, solutions or suspensions, etc., containing a compound or composition of the invention can be used. As used herein, topical application can include mouth washes and gargles.

The compounds used in the methods of the present invention can be administered in intranasal form via topical use of suitable intranasal vehicles and delivery devices, or via transdermal routes, using those forms of transdermal skin patches well known to those of ordinary skill in the art. To be administered in the form of a transdermal delivery system, the dosage administration will, of course, be continuous rather than intermittent throughout the dosage regimen.

The methods, compounds and compositions of the instant invention may also be used in conjunction with other well known therapeutic agents that are selected for their particular usefulness against the condition that is being treated. For example, the instant compounds may be useful in combination with known anti-cancer and cytotoxic agents. Further, the instant methods and compounds may also be useful in combination with other inhibitors of parts of the signaling pathway that links cell surface growth factor receptors to nuclear signals initiating cellular proliferation.

The methods of the present invention may also be useful with other agents that inhibit angiogenesis and thereby inhibit the growth and invasiveness of tumor cells, including, but not limited to VEGF receptor inhibitors, including ribozymes and antisense targeted to VEGF receptors, angiostatin and endostatin.

Examples of antineoplastic agents that can be used in combination with the compounds and methods of the present invention include, in general, and as appropriate, alkylating agents, anti-metabolites, epidophyllotoxins, an antineoplastic enzyme, a topoisomerase inhibitor, procarbazine, mitoxantrone, platinum coordination complexes, biological response modifiers and growth inhibitors, hormonal/anti-hormonal therapeutic agents and haematopoietic growth factors. Exemplary classes of antineoplastic include the anthracyclines, vinca drugs, mitomycins, bleomycins, cytotoxic nucleosides, epothilones, discodermolide, pteridines, diynenes and podophyllotoxins. Particularly useful members of those classes include, for example, carminomycin, daunorubicin, aminopterin, methotrexate, methopterin, dichloromethotrexate, mitomycin C, porfiromycin, 5-fluorouracil, 6-mercaptopurine, gemcitabine, cytosine arabinoside, podophyllotoxin or podo-phyllotoxin derivatives such as etoposide, etoposide phosphate or teniposide, melphalan, vinblastine, vincristine, leurosidine, vindesine, leurosine, paclitaxel and the like. Other useful antineoplastic agents include estramustine, carboplatin, cyclophosphamide, bleomycin, gemcitibine, ifosamide, melphalan, hexamethyl melamine, thiotepa, cytarabin, idatrexate, trimetrexate, dacarbazine, L-asparaginase, camptothecin, CPT-11, topotecan, ara-C, bicalutamide, flutamide, leuprolide, pyridobenzoindole derivatives, interferons and interleukins.

When a compound or composition of the invention is administered into a human subject, the daily dosage will normally be determined by the prescribing physician with the dosage generally varying according to the age, weight, and response of the individual patient, as well as the severity of the patient's symptoms.

In one exemplary application, a suitable amount of compound is administered to a mammal undergoing treatment for cancer, for example, breast cancer. Administration typically occurs in an amount of between about 0.01 mg/kg of body weight to about 100 mg/kg of body weight per day (administered in single or divided doses), more preferably at least about 0.1 mg/kg of body weight per day. A particular therapeutic dosage can include, e.g., from about 0.01 mg to about 1000 mg of compound, and preferably includes, e.g., from about 1 mg to about 1000 mg. The quantity of active compound in a unit dose of preparation may be varied or adjusted from about 0.1 mg to 1000 mg, preferably from about 1 mg to 300 mg, more preferably 10 mg to 200 mg, according to the particular application. The amount administered will vary depending on the particular IC₅₀ value of the compound used and the judgment of the attending clinician taking into consideration factors such as health, weight, and age. In combinational applications in which the compound is not the sole active ingredient, it may be possible to administer lesser amounts of compound and still have therapeutic or prophylactic effect.

Preferably, the pharmaceutical preparation is in unit dosage form. In such form, the preparation is subdivided into unit doses containing appropriate quantities of the active component, e.g., an effective amount to achieve the desired purpose.

The actual dosage employed may be varied depending upon the requirements of the patient and the severity of the condition being treated. Determination of the proper dosage for a particular situation is within the skill of the art. Generally, treatment is initiated with smaller dosages which are less than the optimum dose of the compound. Thereafter, the dosage is increased by small amounts until the optimum effect under the circumstances is reached. For convenience, the total daily dosage may be divided and administered in portions during the day if desired.

The amount and frequency of administration of the compounds and compositions of the present invention used in the methods of the present invention, and if applicable other chemotherapeutic agents and/or radiation therapy, will be regulated according to the judgment of the attending clinician (physician) considering such factors as age, condition and size of the patient as well as severity of the disease being treated.

The chemotherapeutic agent and/or radiation therapy can be administered according to therapeutic protocols well known in the art. It will be apparent to those skilled in the art that the administration of the chemotherapeutic agent and/or radiation therapy can be varied depending on the disease being treated and the known effects of the chemotherapeutic agent and/or radiation therapy on that disease. Also, in accordance with the knowledge of the skilled clinician, the therapeutic protocols (e.g., dosage amounts and times of administration) can be varied in view of the observed effects of the administered therapeutic agents (i.e., antineoplastic agent or radiation) on the patient, and in view of the observed responses of the disease to the administered therapeutic agents.

Also, in general, the compounds of the invention need not be administered in the same pharmaceutical composition as a chemotherapeutic agent, and may, because of different physical and chemical characteristics, be administered by a different route. For example, the compounds/compositions may be administered orally to generate and maintain good blood levels thereof, while the chemotherapeutic agent may be administered intravenously. The determination of the mode of administration and the advisability of administration, where possible, in the same pharmaceutical composition, is well within the knowledge of the skilled clinician. The initial administration can be made according to established protocols known in the art, and then, based upon the observed effects, the dosage, modes of administration and times-of administration can be modified by the skilled clinician.

The particular choice of compound (and where appropriate, chemotherapeutic agent and/or radiation) will depend upon the diagnosis of the attending physicians and their judgment of the condition of the patient and the appropriate treatment protocol.

The compounds/compositions of the invention (and where appropriate chemotherapeutic agent and/or radiation) may be administered concurrently (e.g., simultaneously, essentially simultaneously or within the same treatment protocol) or sequentially, depending upon the nature of the proliferative disease, the condition of the patient, and the actual choice of chemotherapeutic agent and/or radiation to be administered in conjunction (i.e., within a single treatment protocol) with the compound/composition.

In combinational applications and uses, the compound/composition and the chemotherapeutic agent and/or radiation need not be administered simultaneously or essentially simultaneously, and the initial order of administration of the compound/composition, and the chemotherapeutic agent and/or radiation, may not be important. Thus, the compounds/compositions of the invention may be administered first followed by the administration of the chemotherapeutic agent and/or radiation; or the chemotherapeutic agent and/or radiation may be administered first followed by the administration of the compounds/compositions of the invention. This alternate administration may be repeated during a single treatment protocol. The determination of the order of administration, and the number of repetitions of administration of each therapeutic agent during a treatment protocol, is well within the knowledge of the skilled physician after evaluation of the disease being treated and the condition of the patient. For example, the chemotherapeutic agent and/or radiation may be administered first, especially if it is a cytotoxic agent, and then the treatment continued with the administration of the compounds/compositions of the invention followed, where determined advantageous, by the administration of the chemotherapeutic agent and/or radiation, and so on until the treatment protocol is complete.

Thus, in accordance with experience and knowledge,-the practicing physician can modify each protocol for the administration of a compound/composition for treatment according to the individual patient's needs, as the treatment proceeds.

The attending clinician, in judging whether treatment is effective at the dosage administered, will consider the general well-being of the patient as well as more definite signs such as relief of disease-related symptoms, inhibition of tumor growth, actual shrinkage of the tumor, or inhibition of metastasis. Size of the tumor can be measured by standard methods such as radiological studies, e.g., CAT or MRI scan, and successive measurements can be used to judge whether or not growth of the tumor has been retarded or even reversed. Relief of disease-related symptoms such as pain, and improvement in overall condition can also be used to help judge effectiveness of treatment.

V. Assays for Determining HSP90 Binding and Downstream Effect

A variety of in vitro and in vivo assays are available to test the effect of the compounds of the invention on HSP90. HSP90 competitive binding assays and functional assays can be performed as known in the art substituting in the compounds of the invention. Chiosis et al. Chemistry & Biology 2001, 8, 289–299, describe some of the known ways in which this can be done. For example, competition binding assays using, e.g., geldanamycin or 17-AAG as a competitive binding inhibitor of HSP90 can be used to determine relative HSP90 affinity of the compounds of the invention by immobilizing the compound of interest or other competitive inhibitor on a gel or solid matrix, preincubating HSP90 with the other inhibitor, passing the preincubated mix over the gel or matrix, and then measuring the amount of HSP90 that retains or does not retain on the gel or matrix.

Downstream effects can also be evaluated based on the known effect of HSP90 inhibition on function and stability of various steroid receptors and signaling proteins including, e.g., Raf1 and HER2. Compounds of the present invention induce dose-dependent degradation of these molecules, which can be measured using standard techniques. Inhibition of HSP90 also results in up-regulation of HSP90 and related chaperone proteins that can similarly be measured. Antiproliferative activity on various cancer cell lines can also be measured, as can morphological and functional differentiation related to HSP90 inhibition.

Many different types of methods are known in the art for determining protein concentrations and measuring or predicting the level of proteins within cells and in fluid samples. Indirect techniques include nucleic acid hybridization and amplification using, e.g., polymerase chain reaction (PCR). These techniques are known to the person of skill and are discussed, e.g., in Sambrook, Fritsch & Maniatis Molecular Cloning: A Laboratory Manual, 2nd ed., Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y., 1989; Ausubel, et al. Current Protocols in Molecular Biology, John Wiley & Sons, NY, 1994, and, as specifically applied to the quantification, detection, and relative activity of HER2/Neu in patient samples, e.g., in U.S. Pat. Nos. 4,699,877, 4,918,162, 4,968,603, and 5,846,749. A brief discussion of two generic techniques that can be used follows.

The determination of whether cells overexpress or contain elevated levels of HER2 can be determined using well known antibody techniques such as immunoblotting, radioimmunoassays, western blotting, immunoprecipitation, enzyme-linked immunosorbant assays (ELISA), and derivative techniques that make use of antibodies directed against HER2. As an example, HER2 expression in breast cancer cells can be determined with the use of an immunohistochemical assay, such as the Dako Hercep™ test (Dako Corp., Carpinteria, Calif.). The Hercep™ test is an antibody staining assay designed to detect HER2 overexpression in tumor tissue specimens. This particular assay grades HER2 expression into four levels: 0, 1, 2, and 3, with level 3 representing the highest level of HER2 expression. Accurate quantitation can be enhanced by employing an Automated Cellular Imaging System (ACIS) as described, e.g., by Press, M. et al. Modern Pathology 2000, 13, 225A.

Antibodies, polyclonal or monoclonal, can be purchased from a variety of commercial suppliers, or may be manufactured using well-known methods, e.g., as described in Harlow et al. Antibodies: A Laboratory Manual, 2nd ed; Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y., 1988.

HER2 overexpression can also be determined at the nucleic acid level since there is a reported high correlation between overexpression of the HER2 protein and amplification of the gene that codes for it. One way to test this is by using RT-PCR. The genomic and cDNA sequences for HER2 are known. Specific DNA primers can be generated using standard, well-known techniques, and can then be used to amplify template already present in the cell. An example of this is described in Kurokawa, H. et al. Cancer Res. 2000, 60, 5887–5894. PCR can be standardized such that quantitative differences are observed as between normal and abnormal cells, e.g., cancerous and noncancerous cells. Well known methods employing, e.g., densitometry, can be used to quantitate and/or compare nucleic acid levels amplified using PCR.

Similarly, fluorescent in situ hybridization (FISH) assays and other assays can be used, e.g., Northern and/or Southern blotting. These rely on nucleic acid hybridization between the HER2 gene or mRNA and a corresponding nucleic acid probe that can be designed in the same or a similar way as for PCR primers, above. See, e.g., Mitchell MS, and Press M. F. Oncol., Suppl. 1999, 12, 108–116. For FISH, this nucleic acid probe can be conjugated to a fluorescent molecule, e.g., fluorescein and/or rhodamine, that preferably does not interfere with hybridization, and which fluorescence can later be measured following hybridization. See, e.g., Kurokawa, H et al, Cancer Res. 2000, 60, 5887–5894 (describing a specific nucleic acid probe having sequence 5′-FAM-NucleicAcid-TAMRA-p-3′ sequence). ACIS-based approaches as described above can be employed to make the assay more quantitative (de la Torre-Bueno, J., et al. Modern Pathology 2000, 13, 221A).

Immuno and nucleic acid detection can also be directed against proteins other than HSP90 and HER2, which proteins are nevertheless affected in response to HSP90 inhibition.

The following examples are offered by way of illustration only and are not intended to be limiting of the full scope and spirit of the invention.

EXAMPLES I. Materials and Methods

The chemical reagents used to create the novel products of the invention below are all available commercially, e.g., from Aldrich Chemical Co., Milwaukee, Wis., USA. Otherwise their preparation is facile and known to one of ordinary skill in the art, or it is referenced or described herein.

The final compounds were usually purified by preparative TLC (silica gel 60 Å, Whatman Partisil PK6F) or flash chromatography (silica gel 60 Å, EMD) using EtOAc/hexane or MeOH/CH₂Cl₂ as eluents. Rf's were measured using sicila gel TLC plates (silica gel 60 Å, EMD). ¹H-NMR spectra were recorded on a Bruker Avance 400 MHz spectrometer. Analytical HPLC chromatograms were obtained using a C18 column (Agilent Zorbax 300SB-C18; 5 microns; 4.6 mm×150 mm). A gradient was applied between solvent A (0.1% TFA in H₂O) and solvent B (0.5% TFA in CH₃CN) increasing the proportion of A linearly from 5% (t=0) to 100% (t=7.00 min), with a constant flow rate of 1 mL/min. The samples were diluted to typically 0.1–1 mg/mL in MeOH or CH₃CN and the injection volumes were typically 10 μL. The column was not heated, and UV detection was effected at 254 nm.

The chemical names were generated using the Beilstein Autonom 2.1 software.

1. General Procedures to Manipulate the Purine Ring

General Procedure 1.1: Alkylation of Purines at N-9

A suspension of the purine (3 mmol), (hetero)aryl-CH₂-halide (3 mmol, if needed it can be added in batches) and K₂CO₃ (3.3 mmol) in dry DMF (15 mL) was heated to 40–60° C. for 3 to 10 h. Work-up (EtOAc) and purification by preparative TLC or flash chromatography (EtOAc/hexane or MeOH/CH₂Cl₂) yielded the pure N-9 alkylated product.

General Procedure 1.2: Halogenation of Purines at C-8

A solution of purine in MeOH/THF/acetate buffer (1N in each AcOH and AcONa) was treated with Br₂ (1.3-equiv. 1M in CHCl₃) at room temperature (r.t.) for 16 h. Evaporation, work-up (EtOAc), drying (MgSO₄) and flash chromatography afforded the desired 8-bromopurine.

General Procedure 1.3: Nucleophilic Substitution of Purines at C-6

For details, see J. Med. Chem. 1999, 42, 2064–2086.

A) Sulfanyl derivatives: A suspension of 6-chloropurine and sodium or potassium thiolate in THF was heated to reflux for 6–24 hours. Work-up (EtOAc) and flash chromatography afforded the desired 6-sulfanylpurine.

B) Alkoxy derivatives: A suspension of 6-chloropurine and alkoxide in the appropriate alcohol was heated to reflux for 1–16 hours before quenching with water. Evaporation, work-up (EtOAc), and flash chromatography afforded the desired 6-alkoxypurine.

C) Amino derivatives: A solution of 6-chloropurine and alkylamine in MeOH was heated in a sealed tube to 100° C. for 16 hours. Evaporation, work-up (EtOAc), and flash chromatography afforded the desired 6-alkoxypurine.

General procedure 1.4: Methylation of Purines at C-6

A suspension of 6-chloropurine (0.2 mmol) and tetrakis(triphenylphosphino)-palladium (0.02 mmol) in dry THF (3 mL) was treated with trimethylaluminum (2M in toluene, 0.45 mmol) under nitrogen. The resulting solution was heated to reflux for 3 h, cooled to r.t., diluted with toluene (5 mL), and quenched with methanol (0.5 mL) followed by ammonium chloride (1 mmol). The mixture was heated to reflux for 2 h and filtered while hot through a Celite plug. Evaporation and purification by prep TLC afforded the 6-methylpurine. See J. Med. Chem. 1999, 42, 2064–2086.

General Procedure 1.5: Reductive Dehalogenation of 6-halopurine

The 6-halo purine derivative was dissolved in acetic acid and a catalytic amount of 5% Pd/C was added, and the mixture stirred under H₂ atmosphere (1 psi) at r.t. for 1 h., evaporation, and purification afforded the dehalogenated derivatives.

General Procedure 1.6: Acetylation of 2-amino-purines

The 2-amino purine derivative was dissolved in acetic anhydride, treated with a catalytic amount of concentrated sulfuric acid at r.t. for 1 hour. Work-up (EtOAc), evaporation, and purification afforded the 2-acetamido-pyridine.

2. General Procedures to Manipulate the Pyridine Ring

General Procedure 2.1: Preparation of Pyridine N-oxides

A solution of the pyridine derivative (1.0 mmol) in dichloromethane or chloroform (5 mL) was cooled by means of an ice-bath, treated with m-CPBA (1.1 to 3 mmol) in three portions, and allowed to warm to r.t. The mixture was extracted with dichloromethane and washed with aqueous NaOH, followed by water. Drying (Na₂SO₄) and concentration afforded the pyridine N-oxide.

General Procedure 2.2: Preparation of 2-(acetoxymethyl)pyridines

A solution of the 2-methyl pyridine N-oxide (1.0 mmol) in acetic anhydride (5 mmol) was heated to reflux for 0.5 h. Work-up (EtOAc), drying (MgSO₄), evaporation and purification by preparative TLC or flash chromatography afforded the 2-(acetoxymethyl)pyridine.

General Procedure 2.3: Preparation of 2-(hydroxymethyl)pyridines

A suspension of 2-acetoxymethyl-pyridine derivative and solid K₂CO₃ in methanol was heated to 50° C. for 5–30 min. Evaporation, work-up (EtOAc), and drying (MgSO₄) afforded the 2-(hydroxymethyl)pyridine.

General Procedure 2.4: Preparation of 2-(chloromethyl)pyridines

A suspension of 2-hydroxymethyl-pyridine (10 g) in POCl₃ (30 mL) was stirred at 110° C. for 1.5 h. The resulting viscous oil was cooled to r.t. and poured onto ice water (500 g). The pH was adjusted to 10 with solid KOH. Work-up (CHCl₃), drying (MgSO₄) and evaporation gave the 2-(chloromethyl)pyridine, usually as a purple oil or solid, which was used without purification.

General Procedure 2.5: Preparation of 2-(bromomethyl)pyridines

A solution of 2-(hydroxymethyl)pyridine (1.0 mmol) and triphenyl phosphine (1.2 mmol) in dichloromethane or chloroform (5 mL) was cooled to 0° C. A solution of CBr₄ (1.5 mmol) in dichloromethane or chloroform was added dropwise, and the resulting mixture was stirred at 0° C. for 0.5–1 h. Work up followed and purification by flash chromatography afforded the 2-(bromomethyl)pyridine.

General Procedure 2.6: O-alkylation of 3- or 4-hydroxypyridines

A mixture of hydroxypyridine, alkyl halide (1.1 equiv.), base (K₂CO₃, KOH or NaH 1.2–2 equiv.) and solvent (THF or DMF) was stirred at 23–80° C. for 5–30 min. Work-up (EtOAc), drying (Na₂SO₄) and evaporation gave the crude 4-(alkoxy)pyridine, which was purified by preparative TLC or flash chromatography.

General Procedure 2.7: Preparation of Salts.

Method 1: The free base (40 mmol) was heated in MeOH (1:6, 300 mL) until it dissolved. A solution of H₃PO₄ in MeOH (40 mmol) was added dropwise at r.t. The mixture was stirred for 10 min., and the solvent was evaporated to give the pyridinium phosphate as a glassy white solid. The following solvents could also be used: THF, EtOH, or i-PrOH.

Method 2: The free base (50 mmol) was heated in i-PrOH (6 L) until it dissolved. The solution was allowed to cool to r.t. and a solution of HCl in i-PrOH (75 mmol) was added slowly dropwise. The hydrochloride crystallized out of solution within a few minutes, and was collected by filtration, washed (acetone) and dried. The sulfate and mesylate salts were also prepared in this manner.

The hydrochloride salts can also be made by adding CH₃COCl to the alcoholic solution of the pyridine or free base derivative.

Method 3: To a suspension of free base (5 mmol) in MeOH (50 mL) was added a solution of methane sulfonic acid in MeOH (75 mmol) was added slowly dropwise. The mixture became clear within a few minutes, upon addition of i-PrOH (50–100 mL) the salt precipitated out and was collected by filtration, washed with i-PrOH, ether and dried.

These methods can be applied to prepare all other salts.

3. General Procedure to Manipulate Benzene Rings

General Procedure 3.1: Halogenation of Benzene Rings.

Variant 1: A solution of the aromatic compound in MeOH/THF/acetate buffer (1N in each AcOH and AcONa) was treated with Br₂ (1.3 equiv) at r.t. for 5 min. The excess bromine and solvent were removed on a rotary evaporator. Work-up (CHCl₃) and flash chromatography afforded the desired bromobenzene.

Variant 2: A solution of the aromatic compound (7 mmol) and N-halosuccinimide (NCS, NBS, or NIS, 1.06 equiv) in acetic acid (40 mL) was heated to 40–90° C. for 0.3–1 h. Evaporation, work-up (EtOAc) and flash chromatography afforded the desired halogenated benzene.

General Procedure 3.2: Preparation of Benzylic Alcohols

Benzoic acid derivatives were reduced to the corresponding benzylic alcohols according to the procedure given by Bhaskar et al. J. Org. Chem. 1991, 56, 5964–5965.

4. Specific Examples

Example 1 9-(4-Bromo-3,5-dimethyl-pyridin-2-yl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylating 2-amino-6-chloropurine with 4-bromo-2-bromomethyl-3,5-dimethyl-pyridine according to the general procedure 1.1. HPLC Rt: 5.301 min. ¹H-NMR (CDCl₃): δ 8.19 (s, 1H), 7.88 (s, 1H), 5.41 (s, 2H), 5.06 (s, 2H), 2.53 (s, 3H), 2.39 (s, 3H). m/z (%) 367.1 (M+1, 75%), 369.1 (M+3, 100%), 371.1 (M+5, 25%).

The alkylating agent, 4-bromo-2-bromomethyl-3,5-dimethyl-pyridine, could itself be prepared by any of the following three methods:

Method 1

Step 1: 2,3,5-Collidine-N-oxide

Oxidation of 2,3,5-collidine according to the general procedure 2.1 gave 2,3,5-collidine-N-oxide. Yield: 70%. HPLC Rt: 3.96 min. ¹H-NMR (CDCl₃): δ 8.03 (s, 1H), 6.90 (s, 1H), 2.47 (s, 3H), 2.31 (s, 3H), 2.24 (s, 3H). m/z (%) 138.2 (M+1, 100%). Rf (20% MeOH/EtOAc): 0.35.

Step 2: 4-Bromo-2,3,5-collidine-N-oxide

2,3,5-collidine-N-oxide (1.3 g, 10 mmol) and K₂CO₃ (2.9 g, 20 mmol) were suspended in 10 mL of CCl₄. Bromine (1 mL, 20 mmol) was added dropwise, and the reaction mixture was heated to reflux for 2 h. Work-up (EtOAc) and flash chromatography (10% MeOH/EtOAc) afforded the product as a solid (1.05 g, 51% yield). HPLC Rt: 5.239 min. ¹H-NMR (CDCl₃): δ 8.06 (s, ¹H), 2.56 (s, 3H), 2.43 (s, 3H), 2.31 (s, 3H). m/z (%) 216.2 (M+1, 100%), 218.2 (M+3, 100%). Rf (20% MeOH/EtOAc): 0.45.

Step 3: Acetic acid 4-bromo-3,5-dimethyl-pyridin-2-yl methyl ester

4-Bromo-2,3,5-collidine-N-oxide (0.25 g, 11 mmol) was dissolved in acetic anhydride (5 mL) and the solution was heated to reflux for 30 min. Work-up and flash chromatography (50% Hexane/EtOAc) afforded the product (0.27 g, 96% yield). Rf (50% Hexane/EtOAc): 0.70. HPLC Rt: 4.759 min. ¹H-NMR (CDCl₃): δ 8.26 (s, 1H), 5.27 (s, 2H), 2.46 (s, 3H), 2.41 (s, 3H), 2.14 (s, 3H).

Step 4: 4-Bromo-3,5-dimethyl-pyridin-2-yl methanol

A suspension of acetic acid 4-bromo-3,5-dimethyl-pyridin-2-yl methyl ester (0.26 g, 1.0 mmol) and K₂CO₃ (excess) in MeOH (5 mL) was heated to 50° C. for 15 min. Work-up (CHCl₃), filtration through a silica gel pad (eluent: 100% EtOAc) and evaporation gave the title compound as a white solid (0.19 g, 88% yield). Rf (50% Hexane/EtOAc): 0.5. HPLC Rt: 3.80 min. ¹H-NMR (CDCl₃): δ 8.23 (s, 1H), 4.70 (s, 2H), 2.46 (s, 3H), 2.30 (s, 3H).

Step 5: 4-Bromo-2-bromomethyl-3,5-dimethyl-pyridine

The title compound was obtained from 4-bromo-3,5-dimethyl-pyridin-2-yl methanol according to the general procedure 2.5. HPLC Rt: 6.323 min. ¹H-NMR (CDCl₃): δ 8.22 (s, 1H), 4.63 (s, 2H), 2.52 (s, 3H), 2.40 (s, 3H).

Method 2:

Step 1: 2-chloromethyl-3,5-dimethyl-pyridin-4-ol

The title compound was obtained by following the procedure described in the patent by Tarbit, et al. WO 99/10326.

Step 2: 4-bromo-2-chloromethyl-3,5-dimethylpyridine

A neat mixture of 2-chloromethyl-3,5-dimethyl-pyridin-4-ol (8.2 g, 47.8 mmol) and POBr₃ (60 g, 209 mmol) was stirred at 130° C. for 3 h. The resulting viscous oil was cooled to r.t. and poured onto ice water. The pH was adjusted to 10 with solid KOH. Work-up (CHCl₃), drying (MgSO₄) and evaporation afforded the title compound as a purple solid (8.7 g, 78% yield) which was used without purification. HPLC Rt: 6.028 min. ¹H-NMR (CDCl₃): 8.20 (s, 1H), 4.62 (s, 2H), 2.50 (s, 3H), 2.38 (s, 3H).

Method 3:

Step 1: 4-bromo-2-chloromethyl-3,5-dimethyl pyridine

A suspension of 2-chloromethyl-4-methoxy-3,5-dimethyl-pyridine (3.24 g, 14.6 mmol) in PBr₃ (8.0 ml, 85.1 mmol, 5.8 equiv.) was heated to 80° C. under nitrogen. A catalytic amount of DMF (0.50 ml, 6.4 mmol, 0.44 equiv.) was added, whereupon the suspension rapidly turned into an orange solution. After 40 min., the reaction was still incomplete as judged by HPLC. The temperature was raised to 110° C. and the reaction was prolonged for 30 min, at which point it was complete. The mixture was poured over ice, made basic with conc. aq. NH₄OH and extracted into EtOAc. Washing with water, drying (brine, MgSO₄) and concentration gave the title compound as a pink solid (1.51 g, 44%) containing 10% of an impurity by ¹H-NMR. The crude was used without further purification. ¹H-NMR (CDCl₃) δ 8.19 (s, 1H), 4.59 (s, 2H), 2.48 (s, 3H), 2.37 (s, 3H).

Example 2 9-(4-bromo-3,5-dimethyl-pyridin-2-yl methyl)-6-chloro-9H-purin-2-ylamine, phosphate salt

The title compound was obtained by treating 9-(4-bromo-3,5-dimethyl-pyridin-2-yl methyl)-6-chloro-9H-purin-2-ylamine with H₃PO₄ according to the general procedure 2.7. HPLC Rt: 5.294 min. ¹H-NMR (d₆-DMSO): δ 8.12 (s, 1H), 8.09 (s, 1H), 6.83 (s, 2H), 5.47 (s, 2H), 2.49 (s, 3H), 2.29 (s, 3H)

Example 3 9-(4-bromo-3,5-dimethyl-pyridin-2-yl methyl)-6-chloro-9H-purin-2-ylamine, hydrochloric acid salt

The title compound was obtained by treating 9-(4-bromo-3,5-dimethyl-pyridin-2-yl methyl)-6-chloro-9H-purin-2-ylamine with HCl according to the general procedure 2.7. HPLC Rt: 5.294 min. ¹H-NMR (d₆-DMSO): δ 8.13 (s, 1H), 8.12 (s, 1H), 5.47 (s, 2H), 5.47 (s, 2H), 2.49 (s, 3H), 2.30 (s, 3H).

Example 4 9-(4-bromo-3,5-dimethyl-1-oxy-pyridin-2-yl methyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by oxidation of 9-(4-bromo-3,5-dimethyl-pyridin-2-yl)-6-chloro-9H-purin-2-ylamine according to the general procedure 2.1. HPLC Rt: 4.916 min. ¹H-NMR (CDCl₃): δ 8.46 (s, 1H), 8.07 (s, 1H), 5.57 (s, 2H), 5.03 (s, 2H), 2.81 (s, 3H), 2.35 (s, 3H).

Example 5 6-bromo-9-(4-bromo-3,5-dimethyl-pyridin-2-yl methyl)-9H-purin-2-ylamine

A mixture of 6-bromo-9H-purin-2-ylamine (2.4 g, 11 mmol), 4-bromo-2-chloromethyl-3,5-dimethyl pyridine (3.5 g, 15 mmol), K₂CO₃ (2.07 g, 15 mmol) and DMF (50 mL) was stirred at 50° C. for 2 h. Work-up and flash chromatography gave the title compound as a white solid (2.6 g, 56%). HPLC Rt: 5.415 min. ¹H-NMR (CDCl₃): δ 8.17 (s, 1H), 7.88 (s, 1H), 5.38 (s, 2H), 5.05 (s, 2H), 2.51 (s, 3H), 2.37 (s, 3H).

Example 6 6-bromo-9-(4-bromo-3,5-dimethyl-1-oxy-pyridin-2-yl methyl)-9H-purin-2-ylamine

The title compound was obtained by oxidation of 6-bromo-9-(4-bromo-3,5-dimethyl-pyridin-2-yl methyl) according to the general procedure 2.1 (52% yield). Rf (100% EtOAc): 0.1. HPLC Rt: 4.978 min. ¹H-NMR (CDCl₃): δ 8.47 (s, 1H), 8.07 (s, 1H), 5.56 (s, 2H), 5.06 (s, 2H), 2.81 (s, 3H), 2.35 (s, 3H).

Example 7 2-(2-Amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol

The title compound was obtained by alkylating 6-chloro-9H-purin-2-ylamine with 2-chloromethyl-3,5-dimethylpyridin-4-ol according to the general procedure 1.1. HPLC Rt: 3.624 min. ¹H-NMR (d₆-DMSO): δ 8.07 (s, 1H), 7.47 (s, 1H), 6.90 (s, 2H), 5.20 (s, 2H), 2.00 (s, 3H), 1.86 (s, 3H).

Example 8 6-Chloro-9-(4-ethoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with ethyl iodide using the general procedure 2.6. HPLC Rt: 4.321 min. ¹H-NMR (CDCl₃): δ 8.21 (s, 1H), 7.90 (s, 1H), 5.34 (s, 2H), 5.12 (s, 2H), 3.90 (q, 2H), 2.31 (s, 3H) 2.26 (s, 3H), 1.44 (t, 3H).

Example 9 9-(4-Allyloxy-3,5-dimethyl-pyridin-2-ylmethyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with allyll chloride using the general procedure 2.6. HPLC Rt: 4.417 min. ¹H-NMR (CDCl₃): δ 8.20 (s, 1H), 7.90 (s, 1H), 6.03–6.10 (m, 1H), 5.40–5.44 (dd, 1H), 5.34 (s, 2H), 5.29–5.32 (dd, 1H), 5.19 (s, 2H), 4.34–4.36 (m, 2H), 2.30 (s, 3H) 2.25 (s, 3H).

Example 10 6-Chloro-9-[4-(2-ethoxy-ethoxy)-3,5-dimethyl-pyridin-2-ylmethyl]-9H-purin-2-ylamine

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with ethoxyethyl chloride, using the general procedure 2.6. HPLC Rt: 4.388 min. ¹H-NMR (CDCl₃): δ 8.19 (s, 1H), 7.89 (s, 1H), 5.33 (s, 2H), 5.14 (s, 2H), 3.97–4.00 (t, 2H), 3.73–3.76 (t, 2H), 3.56–3.61 (q, 2H), 2.33 (s, 3H), 2.26 (s, 3H), 1.22–1.26 (t, 3H).

Example 11 6-Chloro-9-(4-isopropoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with isopropyl iodide using the general procedure 2.6. HPLC Rt: 4.571 min. ¹H-NMR (CDCl₃): δ 8.17 (s, 1H), 7.89 (s, 1H), 5.32 (s, 2H), 5.06 (s, 2H), 4.20 (m, 1H), 2.26 (s, 3H) 2.22 (s, 3H), 1.28–1.30 (d, 3H).

Example 12 6-Chloro-9-(4-cyclopropylmethoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with cyclopropylmethyl iodide using the general procedure 2.6. HPLC Rt: 4.709 min. ¹H-NMR (CDCl₃): δ 8.20 (s, 1H), 7.90 (s, 1H), 5.34 (s, 2H), 5.09 (s, 2H), 3.68–3.70 (d, 2H), 2.32 (s, 3H) 2.27 (s, 3H), 1.23–1.31 (m, 1H), 0.63–0.68 (m, 2H), 0.30–0.33 (m, 2H).

Example 13 6-Chloro-9-[3,5-dimethyl-4-(3-methyl-butoxy)-pyridin-2-ylmethyl]-9H-purin-2-ylamine

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with 3-methylbutyl bromide using the general procedure 2.6. HPLC Rt: 5.425 min. ¹H-NMR (CDCl₃): δ 8.21 (s, 1H), 7.90 (s, 1H), 5.34 (s, 2H), 5.07 (s, 2H), 3.82–3.86 (t, 2H), 2.31 (s, 3H) 2.26 (s, 3H), 1.84–1.91 (m, 1H), 1.71–1.74 (q, 2H), 1.00 (s, 3H), 0.98 (s, 3H).

Example 14 6-Chloro-9-(4-isobutoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with isobutyl bromide using the general procedure 2.6. HPLC Rt: 4.321 min. ¹H-NMR (CDCl₃): δ 8.21 (s, 1H), 7.90 (s, 1H), 5.34 (s, 2H), 5.12 (s, 2H), 3.58–3.56 (d, 2H), 2.30 (s, 3H) 2.26 (s, 3H), 1.09 (s, 3H), 1.08 (s, 3H).

Example 15 Acetic acid 2-[2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-yloxy]-ethyl ester

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with 2-bromoethyl acetate using the general procedure 2.6. HPLC Rt: 4.103 min. ¹H-NMR (CDCl₃): δ 8.21 (s, 1H), 7.90 (s, 1H), 5.35 (s, 2H), 5.10 (s, 2H), 4.42 (t, 2H), 4.05 (t, 2H), 2.34 (s, 3H) 2.27 (s, 3H), 2.13 (s, 3H).

Example 16 Acetic acid 3-[2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-yloxy]-propyl ester

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol with 2-chloropropyl acetate the general procedure 2.6. HPLC Rt: 4.414 min. ¹H-NMR (CDCl₃): δ 8.21 (s, 1H), 7.91 (s, 1H), 5.34 (s, 2H), 5.12 (s, 2H), 4.34 (t, 2H), 3.90 (t, 2H), 2.31 (s, 3H), 2.25 (s, 3H), 2.15 (m, 1H), 2.09 (s, 3H).

Example 17 6-Chloro-9-(3,5-dimethyl-4-propoxy-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by O-alkylation of 2-(2-amino-6-chloro-purin-9-ylmethyl)-3,5-dimethyl-pyridin-4-ol according to the general procedure 2.6. HPLC Rt: 4.644 min. ¹H-NMR (CDCl₃): δ 8.21 (s, 1H), 7.91 (s, 1H), 5.34 (s, 2H), 5.12 (s, 2H), 3.80–3.76 (t, 2H), 2.31 (s, 3H), 2.26 (s, 3H), 1.85 (m, 2H), 1.07–1.10 (t, 3H).

Example 18 6-Chloro-9-(4-chloro-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: 4-Chloro-2-chloromethyl-3,5-dimethyl pyridine

The title compound was obtained by treating 2-chloromethyl-3,5-dimethyl-pyridin-4-ol with POCl₃ according to the general procedure 2.4 (74% yield). HPLC Rt: 5.543 min. ¹H-NMR (CDCl₃): 8.24 (s, 1H), 4.71 (s, 2H), 2.48 (s, 3H), 2.36 (s, 3H).

Step 2: 6-chloro-9-(4-chloro-3,5-dimethyl-1-oxy-pyridin-2-yl methyl)-9H-purin-2-ylamine

A mixture of 6-chloro-9H-purin-2-ylamine (7 g, 41 mmol), 4-chloro-2-chloromethyl-3,5-dimethyl pyridine (8.2 g, 43 mmol), K₂CO₃ (10 g, 72 mmol) and DMF (200 mL) was heated to 50° C. for 2 h. The reaction mixture was diluted with water (200 mL) and the resulting precipitate was collected by filtration, washed with water, and dried to give the title compound as a beige solid (11.7 g, 88% yield, 90% purity). HPLC Rt: 5.167 min. ¹H-NMR (CDCl₃): δ 8.24 (s, 1H), 7.90 (s, 1H), 5.40 (s, 2H), 5.07 (s, 2H), 2.49 (s, 3H), 2.37 (s, 3H).

Example 19 6-Chloro-9-(4-chloro-3,5-dimethyl-1-oxy-pyridin-2-yl methyl)-9H-purin-2-ylamine

The title compound was obtained by oxidation of 6-chloro-9-(4-chloro-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine according to the general procedure 2.1 (56% yieldy. HPLC Rt: 4.813 min. ¹H-NMR (d₆-DMSO): δ 8.31 (s, 1H), 8.20 (s, 1H), 6.91 (s, 2H), 5.41 (s, 2H), 2.73 (s, 3H), 2.26 (s, 3H).

Example 20 6-Chloro-9-(3,5-dimethyl-pyridin-2-yl methyl)-9H-purin-2-ylamine

Step 1: Acetic acid 3,5-dimethyl-pyridin-2-yl methyl ester

The title compound was prepared from 2,3,5-collidine-N-oxide (see example 1) according to the general procedure 2.2. HPLC Rt: 2.916 min. ¹H-NMR (CDCl₃): δ 8.30 (s, 1H), 7.33 (s, 1H), 5.22 (s, 2H), 2.34 (s, 3H), 2.32 (s, 3H), 2.13 (s, 3H).

Step 2: 3,5-Dimethyl-pyridin-2-yl methanol

The title compound was obtained by deacetylation of acetic acid 3,5-dimethyl-pyridin-2-yl methyl ester according to the general procedure 2.3. HPLC Rt: 2.909 min. ¹H-NMR (CDCl₃): δ 8.24 (s, 1H), 7.30 (s, 1H), 4.85 (broad s, 1H), 4.67 (s, 2H), 2.33 (s, 3H), 2.20 (s, 3H).

Step 3: 2-Bromomethyl-3,5-dimethyl pyridine

The title compound was obtained from 3,5-dimethyl-pyridin-2-yl methanol according to the general procedure 2.5. HPLC Rt: 3.895 min. ¹H-NMR (CDCl₃): δ 8.3 (s, 1H), 7.3 (s, 1H), 4.61 (s, 2H), 2.41 (s, 3H), 2.33 (s, 3H).

Step 4: 6-Chloro-9-(3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-3,5-dimethyl pyridine according to the general procedure 1.1. HPLC Rt: 3.760 min. ¹H-NMR (CDCl₃): δ 8.21 (s, 1H), 7.89 (s, 1H), 7.30 (s, 1H), 5.32 (s, 2H), 5.05 (s, 2H), 2.36 (s, 3H), 2.29 (s, 3H).

Example 21 6-Bromo-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 6-bromo-9H-purin-2-ylamine with 2-chloromethyl-4-methoxy-3,5-dimethylpyridine according to the general procedure 1.1. HPLC Rt: 4.138. ¹H-NMR (CDCl₃): δ 8.21 (s, 1H), 7.91 (s, 1H), 5.34 (s, 2H), 5.12 (s, 2H), 3.77 (s, 3H), 2.32 (s, 3H), 2.27 (s, 3H).). m/z (%) 363.2 (M+1, 100%), 365.2 (M+3, 100%).

Example 22 6-Bromo-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine, phosphate salt

The title compound was obtained by treating 6-bromo-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine with H₃PO₄ according to the general procedure 2.7. HPLC Rt: 4.138. ¹H-NMR (d₆-DMSO): δ 8.07 (s, 1H), 8.02 (s, 1H), 6.84 (s, 2H), 5.35 (s, 2H), 3.73 (s, 3H), 2.29 (s, 3H), 2.15 (s, 3H).). m/z (%) 363.2 (M+1, 100%), 365.2 (M+3, 100%).

Example 23 6-Bromo-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine, hydrochloride salt

The title compound was obtained by treating 6-bromo-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine with HCl according to the general procedure 2.7. HPLC Rt: 4.138. ¹H-NMR (d₆-DMSO): δ 8.44 (s, 1H), 8.26 (s, 1H), 5.57 (s, 2H), 3.96 (s, 3H), 2.35 (s, 3H), 2.34 (s, 3H).

Example 24 6-Bromo-9-(4-methoxy-3,5-dimethyl-1-oxy-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by oxidation of 6-bromo-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine according to the general procedure 2.1. HPLC Rt: 4.439 min. ¹H-NMR (CDCl₃): δ 8.55 (s, 1H), 8.06 (s, 1H), 5.50 (s, 2H), 5.12 (s, 2H), 3.76 (s, 3H), 2.60 (s, 3H), 2.25 (s, 3H). m/z (%) 379.1 (M+1, 100%), 381.1 (M+3, 100%).

Example 25 6-Chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Method 1

The title compound was obtained by alkylating 6-chloro-9H-purin-2-ylamine with 2-chloromethyl-4-methoxy-3,5-dimethylpyridine (or its HCl salt) according to the general procedure 1.1.

Method 2

The title compound could also be obtained by O-methylation of 6-chloro-9-(4-hydroxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine according to the procedure 2.6 (KOH, MeI, DMF, 80° C., 5 min). HPLC Rt: 3.980 min. ¹H-NMR (CDCl₃): δ 8.19 (s, 1H), 7.88 (s, 1H), 5.32 (s, 2H), 5.07 (s, 2H), 3.75 (s, 3H), 2.29 (s, 3H), 2.24 (s, 3H).

Method 3

Step 1: (4-Methoxy-3,5-dimethyl-pyridin-2-yl)-methylamine

A solution of 2-chloromethyl-4-methoxy-3,5-dimethyl-pyridine hydrochloride in 7N methanolic ammonia was placed in a pressure vessel and to 100° C. for 16 h. Concentration and flash chromatography gave the title compound as a greenish solid (76% yield). HPLC Rt: 3.773 min. ¹H-NMR (CDCl₃): δ 8.19 (s, 1H), 4.35 (s, 2H), 3.76 (s, 3H), 2.24 (s, 3H), 2.18 (s, 3H).

Step 2: 6-Chloro-4-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-pyrimidine-2,4,5-triamine

A solution of 4,6-dichloro-pyrimidine-2,5-diamine (see Seela et al. Helv. Chim. Acta. 1986, 69, 1602–1613 and U.S. Pat. No. 5,917,042), 4-methoxy-3,5-dimethyl-pyridin-2-yl)-methylamine, and Et₃N in butanol was heated to reflux for 1 h to give the title compound. HPLC Rt: 3.761 min. ¹H-NMR (CDCl₃): δ 8.24 (s, 1H), 7.15 (s, 1H), 4.60 (s, 2H), 4.56–4.55 (d, 2H), 3.80 (s, 3H), 3.00 (s, 2H), 2.28 (s, 3H), 2.27 (s, 3H).

Step 3: Synthesis of 6-chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The cyclization with trimethylorthoformate in presence of acid to prepare purines can be done. See similar reaction, example 48.

Example 26 6-chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine, phosphate salt

The title compound was obtained treating 6-chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine with H₃PO₄ according to the general procedure 2.7. HPLC Rt: 4.003 min. ¹H-NMR (d₆-DMSO): δ 8.06 (s, 1H), 8.03 (s, 1H), 6.83 (s, 2H), 5.36 (s, 2H), 3.74 (s, 3H), 2.29 (s, 3H), 2.16 (s, 3H).

Example 27 6-Chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine, sulphate salt

The title compound was obtained treating 6-chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine with H₂SO₄ according to the general procedure 2.7. HPLC Rt: 3.999 min. ¹H-NMR (d₆-DMSO): δ 8.36 (s, 1H), 8.15 (s, 1H), 5.52 (s, 2H), 3.93 (s, 3H), 2.31 (s, 3H), 2.30 (s, 3H).

Example 28 6-Chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine, hydrochloride salt

The title compound was obtained treating 6-chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine with HCl according to the general procedure 2.7. HPLC Rt: 4.093 min. ¹H-NMR (d₆-DMSO): δ 8.38 (s, 1H), 8.23 (s, 1H), 5.55 (s, 2H), 3.93 (s, 3H), 2.34 (s, 3H), 2.31 (s, 3H).

Example 29 6-Chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine, mesylate salt

The title compound was obtained treating 6-chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine with MeSO₃H according to the general procedure 2.7. HPLC Rt: 4.093 min. ¹H-NMR (d₆-DMSO): δ 8.38 (s, 1H), 8.17 (s, 1H), 5.54 (s, 2H), 3.95 (s, 3H), 2.36 (s, 3H), 2.34 (s, 3H), 2.33 (s, 3H).

Example 30 N-[6-Chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-yl]-acetamide

A suspension of 6-chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine (80 mg, 0.25 mmol) in acetic acid anhydride (2.2 g) was treated with one drop of concentrated H₂SO₄ and stirred at r.t. for 5 min. Work-up (EtOAc), drying (MgSO₄) and evaporation gave the title compound as a white solid. HPLC Rt: 4.093 min. ¹H-NMR (CDCl₃): δ 8.20 (s, 1H), 8.10 (s, 1H), 5.46 (s, 2H), 3.78 (s, 3H), 2.54 (s, 3H), 2.38 (s, 3H), 2.27 (s, 3H).

Example 31 6-Chloro-9-(4-methoxy-3,5-dimethyl-1-oxy-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by oxidation of 6-chloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine according to the general procedure 2.1. HPLC Rt: 4.435 min. ¹H-NMR (CDCl₃): δ 8.55 (s, 1H), 8.06 (s, 1H), 5.52 (s, 2H), 5.07 (s, 2H), 3.76 (s, 3H), 2.61 (s, 3H), 2.25 (s, 3H).). m/z (%) 335.1 (M+1, 100%), 337.1 (M+3, 34%).

Example 32 6-Chloro-9-(4-methoxy-3,5-dimethyl-1-methoxy-pyridinium-2-methyl)-9H-purin-2-ylamine methyl sulfate salt

A suspension of 6-chloro-9-(4-methoxy-3,5-dimethyl-1-oxy-pyridin-2-ylmethyl)-9H-purin-2-ylamine (0.2 g, 0.56 mmol) in DCM (10 ml) was heated to reflux. Dimethyl sulfate (1.12 mmol) was added dropwise (Tarbit WO 99/10326) and heating was continued for 3 h. Filtration and washing (hot acetone) gave the title compound as a beige solid. HPLC Rt: 3.379 min. ¹H-NMR (d₆-DMSO): δ 9.68 (s, 1H), 9.40 (s, 1H), 5.85 (s, 2H), 4.42 (s, 3H), 4.15 (s, 3H), 4.12 (s, 3H), 2.70 (s, 3H), 2.47 (s, 3H).

Example 33 6-Chloro-9-(6-chloro-4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Method 1

6-Chloro-9-(4-methoxy-3,5-dimethyl-1-oxy-pyridin-2-ylmethyl)-9H-purin-2-ylamine was treated with POCl₃ according to the general procedure 2.4. Flash chromatography gave the title compound as a white solid. HPLC Rt: 5.741 min. ¹H-NMR (CDCl₃): δ 7.94 (s, 1H), 5.29 (s, 2H), 5.05 (s, 2H), 3.74 (s, 3H), 2.30 (s, 3H), 2.28 (s, 3H).

Method 2

Step 1: 2-Chloromethyl-4-methoxy-3,5-dimethylpyridine-1-oxide

The title compound was obtained by oxidation of 2-chloromethyl-4-methoxy-3,5-dimethylpyridine according to the general procedure 2.1. HPLC Rt: 4.462 min. ¹H-NMR (CDCl₃): δ 8.05 (s, 1H), 4.93 (s, 2H), 3.77 (s, 3H), 2.37 (s, 3H), 2.24 (s, 3H).

Step 2: 2-Chloro-6-chloromethyl-4-methoxy-3,5-dimethylpyridine

The title compound was obtained by treating 2-chloromethyl-4-methoxy-3,5-dimethylpyridine-1-oxide with POCl₃ according to the general procedure 2.4. HPLC Rt: 6.757 min. ¹H-NMR (CDCl₃): δ 4.64 (s, 2H), 3.79 (s, 3H), 2.35 (s, 3H), 2.33 (s, 3H).

Step 3: 6-Chloro-9-(6-chloro-4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 6-chloro-9H-purin-2-ylamine with 2-chloro-6-chloromethyl-4-methoxy-3,5-dimethylpyridine according to the general procedure 1.1.

Example 34 6-Chloro-9-(5-methoxy-4-methoxymethyl-6-methyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine

Step 1: Acetic acid 3-acetoxy-5-hydroxymethyl-2-methyl-pyridin-4-ylmethyl ester

The title compound was obtained by following the procedure reported by Morisawa et al. J. Med. Chem. 1974, 17, 1083–1086. HPLC Rt: 3.08 min. ¹H-NMR (CDCl₃): δ 8.41 (s, 1H), 5.20 (s, 2H), 4.80 (s, 2H), 2.40 (s, 3H), 2.38 (s, 3H), 2.03 (s, 3H).

Step 2: Acetic acid 3-acetoxy-5-bromomethyl-2-methyl-pyridin-4-ylmethyl ester

The title compound was obtained from Acetic acid 3-acetoxy-5-hydroxymethyl-2-methyl-pyridin-4-ylmethyl ester according to the general procedure 2.5. HPLC Rt: 5.332 min. ¹H-NMR (CDCl₃): δ 8.43 (s, 1H), 5.22 (s, 2H), 4.70 (s, 2H), 2.43 (s, 3H), 2.41 (s, 3H), 2.06 (s, 3H).

Step 3: 6-Chloro-9-(5-acetoxy-4-acetoxymethyl-6-methyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with acetic acid 3-acetoxy-5-bromomethyl-2-methyl-pyridin-4-ylmethyl ester according to the general procedure 1.1. HPLC Rt: 4.498 min. ¹H-NMR (CDCl₃): δ 8.42 (s, 1H), 7.74 (s, 1H), 5.43 (s, 2H), 5.10 (s, 2H), 5.07 (s, 2H), 2.42 (s, 3H), 2.39 (s, 3H), 1.96 (s, 3H).

Step 4: 6-Chloro-9-(5-hydroxy-4-hydroxymethyl-6-methyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine

A suspension of 6-chloro-9-(5-acetoxy-4-acetoxymethyl-6-methyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine and K₂CO₃ (excess) in MeOH was heated to 50° C. for 15 min. Filtration, work-up (EtOAc) and purification by preparative TLC gave the title compound. HPLC Rt: 4.498 min. ¹H-NMR (d₆-DMSO) δ 8.08 (s, 1H), 7.74 (s, 1H), 6.95 (s, 1H), 5.31 (s, 2H), 4.74 (s, 2H), 2.31 (s, 3H).

Step 5: 6-Chloro-9-(5-methoxy-4-methoxymethyl-6-methyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine

A mixture of 6-chloro-9-(5-hydroxy-4-hydroxymethyl-6-methyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine, MeI, K₂CO₃ (excess) and DMF was heated to 50° C. for 15 min. Work-up (EtOAc), drying (MgSO₄), evaporation, and purification by preparative TLC gave the title compound. HPLC Rt: 5.446 min. ¹H-NMR (CDCl₃) δ 8.35 (s, 1H), 7.70 (s, 1H), 5.35 (s, 2H), 5.25 (s, 2H), 5.15 (s, 2H), 3.80 (s, 3H) 2.59 (s, 3H), 1.970 (s, 3H).

Example 35 Synthesis of 6-Chloro-9-(5-ethoxy-4-hydroxymethyl-6-methyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine

A mixture of 6-chloro-9-(5-hydroxy-4-hydroxymethyl-6-methyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine (see previous example), EtI (excess), K₂CO₃ (excess) and DMF was heated to 50° C. for 15 min. Work-up (EtOAc), drying (MgSO₄), evaporation, and purification by preparative TLC gave the title compound. HPLC Rt: 3.720 min. ¹H-NMR (CDCl₃) δ 8.27 (s, 1H), 7.90 (s, 1H), 5.40 (s, 2H), 5.11 (s, 2H), 4.85 (d, 2H), 4.50 (t, 1H), 3.95 (q, 2H), 2.51 (s, 3H), 1.45 (t, 3H).

Example 36 6-Chloro-9-(3,5-dimethyl-4-amino-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: 2-Bromomethyl-3,5-dimethyl-4-nitro-pyridine

The title compound was obtained from (3,5-dimethyl-4-nitro-pyridin-2-yl)-methanol according to the general procedure 2.5. HPLC Rt: 6.206 min. ¹H-NMR (CDCl₃) δ 8.46 (s, 1H), 4.64 (s, 2H), 2.38 (s, 3H), 2.33 (s, 3H).

Step 2: 6-Chloro-9-(3,5-dimethyl-4-nitro-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-3,5-dimethyl-4-nitro-pyridine according to the general procedure 1.1 HPLC Rt: 6.206 min. ¹H-NMR (CDCl₃) δ 8.40 (s, 1H), 7.94 (s, 1H), 5.40 (s, 2H), 5.05 (s, 2H), 2.40 (s, 3H), 2.27 (s, 3H).

Step 3: 6-Chloro-9-(3,5-dimethyl-4-amino-pyridin-2-ylmethyl)-9H-purin-2-ylamine

A suspension of 6-chloro-9-(4,6-dimethyl-5-nitro-pyridin-3-ylmethyl)-9H-purin-2-ylamine and excess of sodium hydrosulfite (Na₂S₂O₄) in methanol was stirred for 2 days at r.t. The MeOH was evaporated before extracting with EtOAc. Evaporation and purification by preparative TLC (100% EtOAc) gave the title compound. HPLC Rt: 3.544 min. ¹H-NMR (CDCl₃) δ 8.05 (s, 1H), 7.83 (s, 1H), 5.31 (s, 2H), 5.05 (s, 2H), 4.08 (s, 2H), 2.12 (s, 6H).

Example 37 6-Chloro-9-(3-methoxy-5-methoxymethyl-4-methyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: 3-Methoxy-5-methoxymethyl-2,4-dimethyl-pyridine

The title compound was obtained by treating a solution of 5-hydroxymethyl-2,4-dimethyl-pyridin-3-ol hydrochloride (1 g, 5.2 mmol) in DMF with MeI (2.28 g, 15 mmol) and NaH (0.6 g, 50 mmol) for 1 h at 0° C. HPLC Rt: 2.835 min. ¹H-NMR (CDCl₃) δ 8.16 (s, 1H), 4.44 (s, 2H), 3.75 (s, 3H), 3.41 (s, 3H), 2.53 (s, 3H), 2.32 (s, 3H).

Step 2: 3-Methoxy-5-methoxymethyl-2,4-dimethyl-pyridine 1-oxide

The title compound was obtained by oxidation of 3-methoxy-5-methoxymethyl-2,4-dimethyl-pyridine according to the general procedure 2.1. HPLC Rt: 4.181 min. ¹H-NMR (CDCl₃) δ 8.18 (s, 1H), 4.39 (s, 2H), 3.76 (s, 3H), 3.43 (s, 3H), 2.52 (s, 3H), 2.46 (s, 3H).

Step 3: Acetic acid 3-methoxy-5-methoxymethyl-4-methyl-pyridin-2-ylmethyl ester

The title compound was obtained by treating 3-methoxy-5-methoxymethyl-2,4-dimethyl-pyridine 1-oxide with Ac₂O according to the general procedure 2.2. HPLC Rt: 4.062 min. ¹H-NMR (CDCl₃) δ 8.32 (s, 1H), 5.27 (s, 2H), 4.47 (s, 2H), 3.80 (s, 3H), 3.43 (s, 3H), 2.34 (s, 3H), 2.25 (s, 3H).

Step 4: (3-Methoxy-5-methoxymethyl-4-methyl-pyridin-2-yl)-methanol

The title compound was obtained from acetic acid 3-methoxy-5-methoxymethyl-4-methyl-pyridin-2-ylmethyl ester according to the general procedure 2.3. HPLC Rt: 3.465 min. ¹H-NMR (CDCl₃) δ 8.22 (s, 1H), 4.75 (d, 2H), 4.47 (s, 2H), 4.20 (t, 1H), 3.77 (s, 3H), 3.43 (s, 3H), 2.34 (s, 3H).

Step 5: 2-Bromomethyl-3-methoxy-5-methoxymethyl-4-methyl-pyridine

The title compound was obtained from (3-methoxy-5-methoxymethyl-4-methyl-pyridin-2-yl)-methanol according to the general procedure 2.5. HPLC Rt: 4.498 min. ¹H-NMR (CDCl₃) δ 8.22 (s, 1H), 4.695 (s, 2H), 4.42 (s, 2H), 3.86 (s, 3H), 3.40 (s, 3H), 2.31 (s, 3H).

Step 6: 6-Chloro-9-(3-methoxy-5-methoxymethyl-4-methyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-3-methoxy-5-methoxymethyl-4-methyl-pyridine according to the general procedure 1.1. HPLC Rt: 4.254 min. ¹H-NMR (CDCl₃) δ 8.210 (s, 1H), 7.96 (s, 1H), 5.40 (s, 2H), 5.05 (s, 2H), 4.42 (s, 2H), 3.78 (s, 3H), 3.40 (s, 3H), 2.31 (s, 3H).

Example 38 6-Chloro-9-(5-chloro-6-methoxy-pyridin-3-ylmethyl)-9H-purin-2-ylamine

Step 1: (5-Chloro-6-methoxy-pyridin-3-yl)-methanol

(5,6-Dichloro-pyridin-3-yl)-methanol was dissolved in a saturated solution of NaOMe in MeOH and heated to reflux overnight. Evaporation of MeOH, work-up (EtOAc) and evaporation gave the title compound. ¹H-NMR (CDCl₃) δ 8.03 (d, 1H), 7.72 (d, 1H), 4.65 (s, 2H), 4.04 (s, 3H).

Step 2: 5-Bromomethyl-3-chloro-2-methoxy-pyridine

The title compound was obtained from (5-chloro-6-methoxy-pyridin-3-yl)-methanol according to the general procedure 2.5. ¹H-NMR (CDCl₃) δ 8.05 (d, 1H), 7.70 (d, 1H), 4.42 (s, 2H), 4.02 (s, 3H).

Step 3: 6-Chloro-9-(5-chloro-6-methoxy-pyridin-3-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 5-bromomethyl-3-chloro-2-methoxy-pyridine according to the general procedure 1.1. HPLC Rt: 5.256 min. ¹H-NMR (CDCl₃) δ 8.11 (d, 1H), 7.78 (s, 1H), 7.63 (d, 1H), 5.19 (s, 2H), 5.16 (s, 2H), 4.04 (s, 3H).

Example 39 6-chloro-9-(3,4-dimethoxy-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-chloromethyl-3,4-dimethoxylpyridine hydrochloride according to the general procedure 1.1. HPLC Rt: 3.777 min. ¹H-NMR (CDCl₃): δ 8.19 (d, 1H), 7.95 (s, 1H), 6.82 (d, 1H), 5.39 (s, 2H), 5.09 (s, 2H), 3.92 (s, 3H), 3.87 (s, 3H).

Example 40 6-chloro-9-(3-methoxy-6-methyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: (3-Methoxy-6-methyl-pyridin-2-yl)-methanol

The title compound was obtained by O-methylation of 2-hydroxymethyl-6-methyl-pyridin-3-ol according to the general procedure 2.6. HPLC Rt: 2.304 min. ¹H-NMR (CDCl₃) δ 7.05–7.11 (m, 2H), 4.72–4.71 (d, 2H), 4.47–4.49 (t, 1H), 3.84 (s, 3H), 2.51 (s, 3H).

Step 2: 2-Bromomethyl-3-methoxy-6-methyl-pyridine

The title compound was obtained from (3-Methoxy-6-methyl-pyridin-2-yl)-methanol according to the general procedure 2.5. HPLC Rt: 4.361. ¹H-NMR (CDCl₃) δ 7.06–7.12 (m, 2H), 4.61 (s, 2H), 3.89 (s, 3H), 2.49 (s, 3H).

Step 3: 6-chloro-9-(3-methoxy-6-methyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-3-methoxy-6-methylpyridine according to the general procedure 1.1. HPLC Rt: 3.777 min. ¹H-NMR (CDCl₃): δ 7.92 (s, 1H), 7.11 (m, 2H), 5.39 (s, 2H), 5.15 (s, 2H), 3.85 (s, 3H), 2.45 (s, 3H).

Example 41 6-Chloro-9-(5-methoxy-4,6-dimethyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine

Step 1: (5-Methoxy-4,6-dimethyl-pyridin-3-yl)-methanol

The title compound was obtained by O-methylation of 5-hydroxymethyl-2,4-dimethyl-pyridin-3-ol according to the general procedure 2.6. HPLC Rt: 3.114 min. ¹H-NMR (CDCl₃) δ 8.08 (s, 1H), 4.67 (s, 2H), 3.74 (s, 3H), 2.49 (s, 3H), 2.33 (s, 3H).

Step 2: 5-Bromomethyl-3-methoxy-2,4-dimethyl-pyridine

The title compound was obtained from (5-methoxy-4,6-dimethyl-pyridin-3-yl)-methanol according to the general procedure 2.5. HPLC Rt: 2.873. ¹H-NMR (CDCl₃) δ 8.22 (s, 1H), 4.50 (s, 2H), 3.764 (s, 3H), 2.54 (s, 3H), 2.37 (s, 3H).

Step 3: 6-Chloro-9-(5-methoxy-4,6-dimethyl-pyridin-3-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 5-bromomethyl-3-methoxy-2,4-methylpyridine according to the general procedure 1.1. HPLC Rt: 3.7387 min. ¹H-NMR (CDCl₃): δ 8.25 (s, 1H), 7.63 (s, 1H), 5.39 (s, 2H), 5.11 (s, 2H), 3.73 (s, 3H), 2.55 (s, 3H), 2.22 (s, 3H).

Example 42 9-(4-Methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-chloromethyl-4-methoxy-3,5-dimethylpyridine hydrochloride according to the general procedure 1.1. HPLC Rt: 3.434 min. ¹H-NMR (CDCl₃): δ 8.75 (s, 1H), 8.25 (s, 1H), 7.90 (s, 1H), 5.37 (s, 2H), 5.07 (s, 2H), 3.77 (s, 3H), 2.32 (s, 3H), 2.26 (s, 3H).

Example 43 6-Chloro-9-(3,5-dimethoxy-4-methyl-benzyl)-9H-purin-2-ylamine

Step 1: (3,5-Dimethoxy-4-methyl-phenyl)-methanol

The title compound was obtained by reducing 3,5-dimethoxy-4-methyl-benzoic acid as described by Bhaskar et al. J. Org. Chem. 1991, 56, 5964–5965. HPLC Rt: 5.352. ¹H-NMR (CDCl₃): δ 6.58 (s, 2H), 4.68 (s, 2H), 3.85 (s, 6H), 2.10 (s, 3H).

Step 2: 5-Bromomethyl-1,3-dimethoxy-2-methyl-benzene

The title compound was obtained from (3,5-dimethoxy-4-methyl-phenyl)-methanol according to the general-procedure 2.5. HPLC Rt: 7.200. ¹H-NMR (CDCl₃): δ 6.59 (s, 2H), 4.51 (s, 2H), 3.86 (s, 3H), 3.85 (s, 3H), 2.22 (s, 3H).

Step 3: 6-Chloro-9-(3,5-dimethoxy-4-methyl-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 5-bromomethyl-1,3-dimethoxy-4-methyl benzene according to the general procedure 1.1. HPLC Rt: 5.841 min. ¹H-NMR (CDCl₃): δ 7.75 (s, 1H), 6.46 (s, 1H), 5.21 (s, 2H), 5.07 (s, 2H), 3.80 (s, 6H), 2.09 (s, 3H).

Example 44 9-(2-Bromo-3,5-dimethoxy-4-methyl-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by brominating 6-chloro-9-(3,5-dimethoxy-4-methyl-benzyl)-9H-purin-2-ylamine with bromine according to the general procedure 3.1. HPLC Rt: 6.222 min. ¹H-NMR (CDCl₃): δ 7.85 (s, 1H), 6.60 (s, 1H), 5.36 (s, 2H), 5.07 (s, 2H), 3.80 (s, 3H), 3.74 (s, 3H), 2.20 (s, 3H).

Example 45 8-Bromo-9-(2-bromo-3,5-dimethoxy-4-methyl-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by brominating 6-chloro-9-(3,5-dimethoxy-4-methyl-benzyl)-9H-purin-2-ylamine with excess bromine according to the general procedure 3.1. HPLC Rt: 7.040 min. ¹H-NMR (CDCl₃): δ 5.88 (s, 1H), 5.38 (s, 2H), 5.14 (s, 2H), 3.83 (s, 3H), 3.57 (s, 3H), 2.19 (s, 3H).

Example 46 2,6-Dichloro-9-(4-methoxy-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-chloromethyl-4-methoxy-3,5-dimethylpyridine (or its HCl salt) according to the general procedure 1.1. HPLC Rt: 5.081 min. ¹H-NMR (CDCl₃): δ 8.30 (s, 1H), 8.17 (s, 1H), 5.50 (s, 2H), 3.80 (s, 3H), 2.38 (s, 3H), 2.27 (s, 3H).

Example 47 8-butyl-6-chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: 6-Chloro-N4-(3,4,5-trimethoxy-benzyl)-pyrimidine-2,4,5-triamine

The title compound was obtained by refluxing 4,6-dichloro-pyrimidine-2,5-diamine (see Seela et al. Helv. Chim. Acta. 1986, 69, 1602–1613 and U.S. Pat. No. 5,917,042), 3,4,-5-trimethoxybenzylamine, and Et₃N in butanol or ethanol for 1 to 14 h. HPLC Rt: 4.327 min. ¹H-NMR (CDCl₃): δ 6.57 (s, 2H), 5.65 (t, 1H), 4.75 (s, 2H), 4.54 (d, 2H), 3.86–3.87 (d, 9H).

Step 2: 8-Butyl-6-chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by following the procedure given in WO 98/39344. HPLC Rt: 5.971 min. ¹H-NMR (CDCl₃): δ 6.34 (s, 2H), 5.19 (s, 2H), 5.04 (s, 2H), 3.81 (s, 3H), 3.77 (s, 6H), 2.71–2.75 (t, 2H), 1.68–1.74 (m, 2H), 1.35–1.41 (m, 2H), 0.88–0.92 (t, 2H).

Example 48 6-Chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 3,4,5-trimethoxybenzyl according to the general procedure 1.1. The title compound was also obtained by treating a solution of 6-chloro-N-4-(3,4,5-trimethoxy-benzyl)-pyrimidine-2,4,5-triamine in triethyl orthoformate with a catalytic amount of conc. HCl at r.t. for 20 min. HPLC Rt: 4.906 min. ¹H-NMR (CDCl₃): δ 7.76 (s, 1H), 6.51 (s, 2H), 5.18 (s, 2H), 5.12 (s, 2H), 3.85 (s, 3H), 3.84 (s, 6H).

Example 49 Acetic acid 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenyl ester

Step 1: Acetic acid 4-hydroxymethyl-2,6-dimethoxy-phenyl ester

A solution of acetic acid 4-formyl-2,6-dimethoxy-phenyl ester (25 mmol) in MeOH (100 mL) was treated with NaBH₄ (1 equiv.) at 0° C. for 15 min. After quenching with acetone and evaporating the solvent, work-up (CH₂Cl₂) and evaporation gave the title compound as a white solid (85% yield). Rf (in EtOAc/Hexane 1:1): 0.5. ¹H-NMR (CDCl₃): δ 6.66 (s, 1H), 4.68–4.70 (d, 2H), 3.85 (s, 3H), 2.36 (s, 3H), 1.74 (t, 1H).

Step 2: Acetic acid 3-bromo-4-hydroxymethyl-2,6-dimethoxy-phenyl ester

The title compound was obtained by bromination of acetic acid 4-hydroxymethyl-2,6-dimethoxy-phenyl ester in AcOH/AcONa buffer according to the general procedure 3.1. Rf (EtOAc/Hexane 1:3): 0.2. ¹H-NMR (CDCl₃): δ 7.01 (s, 1H), 4.75–4.76 (d, 2H), 3.86 (s, 3H), 3.85 (s, 3H), 2.38 (s, 3H), 2.05 (t, 1H).

Step 3: Acetic acid 3-bromo-4-bromomethyl-2,6-dimethoxy-phenyl ester

The title compound was obtained from Acetic acid 3-bromo-4-hydroxymethyl-2,6-dimethoxy-phenyl ester according to the general procedure 2.5. Rf (EtOAc/Hexane 1:3): 0.8. ¹H-NMR (CDCl₃): δ 6.87 (s, 1H), 4.60 (s, 2H), 3.84 (s, 3H), 3.83 (s, 3H), 2.36 (s, 3H).

Step 4: Acetic acid 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenyl ester

The title compound was obtained by alkylation of 2-amino-6-chloropurine with acetic acid 3-bromo-4-bromomethyl-2,6-dimethoxy-phenyl ester according to the general procedure 1.1. HPLC Rt: 5.081 min. ¹H-NMR (CDCl₃): δ 8.30 (s, 1H), 8.17 (s, 1H), 5.50 (s, 2H), 3.80 (s, 3H), 2.38 (s, 3H), 2.27 (s, 3H).

Example 50 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol

The title compound was obtained by deacetylation of Acetic acid 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenyl ester (see previous example) in NH₃/MeOH at r.t. for 0.5 h or K₂CO₃ in methanol according to the general procedure 2.3. HPLC Rt: 4.912 min. ¹H-NMR (CDCl₃): δ 7.85 (s, 1H), 6.72 (s, 1H), 5.70 (s, 1H), 5.33 (s, 1H), 5.07 (s, 2H), 3.94 (s, 3H), 3.82 (s, 3H).

Example 51 9-(2-bromo-3,4,5-trimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by O-methylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see previous example) according to the general procedure 2.6. The title compound could also be obtained by bromination of 6-chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine (see example 48) in acetate buffer according to the general procedure 3.1. HPLC Rt: 5.742 min. ¹H-NMR (CDCl₃): δ 7.85 (s, 1H), 6.66 (s, 1H), 5.32 (s, 2H), 5.11 (s, 2H), 3.90 (s, 3H), 3.87 (s, 3H), 3.76 (s, 3H).

Example 52 9-(4-allyloxy-2-bromo-3,5-dimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see example 50) with 3-bromo-propene in DMF in the presence of K₂CO₃ at 70° C. for 0.25–1 h. HPLC Rt: 6.309 min. ¹H-NMR (CDCl₃): δ 7.84 (s, 1H), 6.64 (s, 1H), 6.00–6.10 (m, 2H), 5.36–5.36 (m, 1H), 5.31 (s, 2H), 5.20–5.21 (m, 2H), 4.52–4.54 (m, 2H), 3.90 (s, 3H), 3.74 (s, 2H).

Example 53 9-(2-bromo-4-chloromethoxy-3,5-dimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see example 50) with chloroiodomethane in DMF in the presence of K₂CO₃ at 70° C. for 0.25–1 h. HPLC Rt: 6.109 min. ¹H-NMR (CDCl₃): δ 7.87 (s, 1H), 6.66 (s, 1H), 5.91 (s, 2H), 5.34 (s, 2H), 5.08 (s, 2H), 3.90 (s, 3H), 3.76 (s, 3H).

Example 54 9-[2-bromo-4-(2-chloro-ethoxy)-3,5-dimethoxy-benzyl]-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see example 50) with 1-bromo-2-chloro-ethane in DMF in the presence of K₂CO₃ at 70° C. for 0.25–1 h. HPLC Rt: 6.285 min. ¹H-NMR (CDCl₃): δ 7.86 (s, 1H), 6.67 (s, 1H), 5.37 (s, 2H), 5.32 (s, 2H), 4.22–4.25 (t, 2H), 3.91 (s, 3H), 3.77–3.78 (t, 2H), 3.75 (s, 3H).

Example 55 9-(2-bromo-4-cyclopropylmethoxy-3,5-dimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see example 50) with bromomethyl-cyclopropane in DMF in the presence of K₂CO₃ at 70° C. for 0.25–1 h. HPLC Rt: 6.512 min. ¹H-NMR (CDCl₃): δ 7.86 (s, 1H), 6.67 (s, 1H), 5.34 (s, 2H), 5.17 (s, 2H), 3.95 (s, 3H), 3.83–3.84 (d, 2H), 3.77 (s, 3H), 1.27 (m, 1H), 0.58–0.62 (m, 2H), 0.28–0.32 (m, 2H).

Example 56 9-(2-bromo-4-ethoxy-3,5-dimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see example 50) with EtI in DMF in the presence of K₂CO₃ at 70° C. for 0.25–1 h. HPLC Rt: 6.112 min. ¹H-NMR (CDCl₃): δ 7.84 (s, 1H), 6.65 (s, 1H), 5.31 (s, 2H), 5.13 (s, 2H), 4.04–4.09 (q, 2H), 3.90 (s, 3H), 3.82 (s, 3H), 1.32–1.38 (t, 3H).

Example 57 9-(2-bromo-3,5-dimethoxy-4-propoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see example 50) with PrI in DMF in the presence of K₂CO₃ at 70° C. for 0.25–1 h. HPLC Rt: 6.594 min. ¹H-NMR (CDCl₃): δ 7.84 (s, 1H), 6.65 (s, 1H), 5.30 (s, 2H), 5.14 (s, 2H), 3.93–3.97 (t, 2H), 3.89 (s, 3H), 3.74 (s, 3H), 1.72–1.81 (m, 2H), 1.00–1.04 (t, 3H).

Example 58 9-(2-bromo-4-butoxy-3,5-dimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see example 50) with BuI in DMF in the presence of K₂CO₃ at 70° C. for 0.25–1 h. HPLC Rt: 6.594 min. ¹H-NMR (CDCl₃): δ 7.84 (s, 1H), 6.65 (s, 1H), 5.30 (s, 2H), 5.14 (s, 2H), 3.97–4.00 (t, 2H), 3.89 (s, 3H), 3.74 (s, 3H), 1.68–1.76 (m, 2H), 1.44–1.53 (m, 2H), 0.94–0.97 (t, 3H).

Example 59 6-chloro-9-(3-methoxymethoxy-6-methyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: (3-methoxymethoxy-6-methyl-pyridin-2-yl)-methanol

The title compound was obtained by O-alkylation of 2-hydroxymethyl-6-methyl-pyridin-3-ol with chloromethyl methyl ether according to the general procedure 2.6. ¹H-NMR (CDCl₃) δ 7.28–7.30 (d, 1H), 6.98–7.00 (d, 1H), 5.17 (s, 2H), 4.71 (s, 2H), 4.50 (s, 2H), 3.45 (s, 3H), 2.49 (s, 3H).

Step 2: 2-Bromomethyl-3-methoxymethoxy-6-methyl-pyridine

The title compound was obtained from (3-methoxymethoxy-6-methyl-pyridin-2-yl)-methanol according to the general procedure 2.5. ¹H-NMR (CDCl₃) δ 7.32–7.40 (d 1H), 7.08–7.10 (d, 1H), 5.30 (s, 2H), 4.67 (s, 2H), 3.55 (s, 3H), 2.54 (s, 3H).

Step 3: 6-Chloro-9-(3-methoxymethoxy-6-methyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-3-methoxymethoxy-6-methyl-pyridine according to the general procedure 1.1. HPLC Rt: 3.884 min. ¹H-NMR (CDCl₃): δ 7.92 (s, 1H), 7.34–7.36 (d, 1H), 7.05–7.07 (d, 1H), 5.39 (s, 2H), 5.17 (s, 2H), 5.06 (s, 2H), 3.40 (s, 3H), 2.44 (s, 3H).

Example 60 3-(2-Amino-6-chloro-purin-9-ylmethyl)-3H-benzothiazole-2-thione

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 3-chloromethyl-3H-benzothiazole-2-thione according to the general procedure 1.1. HPLC Rt: 5.982 min. ¹H-NMR (d₆-DMSO): δ 8.37 (s, 1H), 8.25–8.28 (d, 1H) 7.79–7.81 (d, 1H), 7.54–7.56 (t, 1H), 7.39–7.43 (m 1H), 7.20 (s, 2H), 6.62 (s, 2H), 3.34 (s, 3H).

Example 61 6-Chloro-9-(2,5-dimethyl-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-chloromethyl-1,4-dimethyl-benzene according to the general procedure 1.1. HPLC Rt: 5.920 min. ¹H-NMR (d₆-DMSO): δ 8.10 (s, 1H), 7.10 (d, 1H) 7.04 (d, 1H), 6.95 (s, 2H), 6.65 (s, 1H), 5.23, (s, 2H), 3.34 (s, 3H), 2.30 (s, 3H), 2.17 (s, 3H).

Example 62 6-Chloro-9-isoquinolin-1-ylmethyl-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-isoquinoline according to the general procedure 1.1. HPLC Rt: 4.306 min. ¹H-NMR (d₆-DMSO): δ 8.43–8.45 (d, 1H) 8.27–8.28 (d, 1H), 8.20 (s, 1H), 8.03–8.05 (d 1H), 7.85–7.89 (m, 1H), 7.77–7.82 (m, 2H), 6.83 (s, 2H), 6.04 (s, 2H).

Example 63 9-benzo[1,2,5]thiadiazol-5-ylmethyl-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 5-bromomethyl-benzo[1,2,5]thiadiazole according to the general procedure 1.1. HPLC Rt: 4.931 min. ¹H-NMR (d₆-DMSO): δ 8.31 (s, 1H), 8.11 (d, 1H), 7.87 (br. s, 1H), 7.70–7.67 (dd, 1H), 6.98 (br, s, 2H), 5.52 (s, 2H).

Example 64 9-(1-methyl-1H-benzotriazol-5-ylmethyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 6-bromomethyl-1-methyl-1H-benzotriazole according to the general procedure 1.1. HPLC Rt: 4.295 min. ¹H-NMR (d₆-DMSO): δ 8.29 (s, 1H), 7.95 (s, 1H), 7.86–7.84 (d, 1H), 7.55–7.53 (dd, 1H), 6.97 (s, 2H), 5.45 (s, 2H), 4.3 (s, 3H).

Example 65 6-chloro-9-(6-chloro-benzo[1,2,5]thiadiazol-5-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 5-bromomethyl-6-chloro-benzo[1,2,5]thiadiazole according to the general procedure 1.1. HPLC Rt: 5.400 min. ¹H-NMR (d₆-DMSO): δ 8.45 (s, 1H), 8.20 (s, 1H), 7.64 (s, 1H), 6.97 (s, 2H), 5.55 (s, 2H).

Example 66 9-benzo[1,2,5]thiadiazol-4-ylmethyl-6-chloro-9H-purin-2-ylamine

The title compound was-obtained by alkylation of 2-amino-6-chloropurine with 4-bromomethyl-benzo[1,2,5}thiadiazole according to the general procedure 1.1. HPLC Rt: 5.027 min. ¹H-NMR (d₆-DMSO): δ 8.26 (s, 1H), 8.04–8.07 (d, 1H), 7.68–7.64 (dd, 1H), 7.22–7.20 (dd, 1H), 6.93 (s, 2H), 5.79 (s, 2H).

Example 67 6-chloro-9-(6-fluoro-4a,8a-dihydro-4H-benzo[1,3]dioxin-8-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 8-chloromethyl-6-fluoro-4a,8a-dihydro-4H-benzo[1,3]dioxine according to the general procedure 1.1. HPLC Rt: 5.172 min. ¹H-NMR (CDCl₃): δ 7.84 (s, 1H), 6.92–6.89 (dd, 1H), 6.70–6.67 (dd, 1H), 5.31 (s, 2H), 5.22 (s, 2H), 5.07 (s, 2H), 4.90 (s, 2H).

Example 68 1-[3-(2-Amino-6-chloro-purin-9-ylmethyl)-4-methoxy-phenyl]-ethanone

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-(3-chloromethyl-4-methoxy-phenyl)-ethanone according to the general procedure 1.1. HPLC Rt: 4.887 min. ¹H-NMR (CDCl₃): δ 8.03–8.02 (d, 1H), 7.97–7.95 (dd, 1H), 7.81 (s, 1H), 6.96–6.93 (d, 1H), 5.25 (s, 2H), 5.08 (s, 2H), 3.93 (s, 3H), 2.54 (s, 3H).

Example 69 6-chloro-9-(3-trifluoromethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-chloromethyl-3-trifluoromethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.965 min. ¹H-NMR (CDCl₃): δ 7.76 (s, 1H), 7.39–7.37 (t, 1H), 7.21–7.15 (m, 3H), 5.27 (s, 2H), 5.12 (s, 2H).

Example 70 6-chloro-9-(2-fluoro-3-trifluoromethyl-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2-fluoro-3-trifluoromethyl-benzene according to the general procedure 1.1. HPLC Rt: 4.841 min. ¹H-NMR (CDCl₃): δ 7.83 (s, 1H), 7.63–7.59 (t, 1H), 7.48–7.45 (t, 1H), 7.25–7.22 (t, 1H), 5.36 (s, 2H), 5.12 (s, 2H).

Example 71 6-Chloro-9-(2-fluoro-4,5-dimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: (2-Fluoro-4,5-dimethoxy-phenyl)-methanol

A solution of 2-fluoro-4,5-dimethoxy-benzaldehyde (6.0 mmol) in MeOH (10 mL) was treated with NaBH₄ (1.2 equiv.) at 0–23° C. for 0.5 h. After quenching with acetone and evaporating the solvent, work-up (CH₂Cl₂), drying (MgSO₄) and evaporation gave the title compound as a crude oily product (94% yield). ¹H-NMR (CDCl₃): δ 6.90–6.88 (d, 1H), 6.61–6.64 (d, 1H), 4.65–4.63 (d, 2H), 3.86 (s, 3H), 3.84 (s, 3H), 2.00–1.94 (t, 1H).

Step 2: 1-Bromomethyl-2-fluoro-4,5-dimethoxy-benzene

The title compound was obtained from (2-fluoro-4,5-dimethoxy-phenyl)-methanol according to the general procedure 2.5. ¹H-NMR (CDCl₃): δ 6.84–6.81 (d, 1H), 6.64–6.61 (d, 1H), 4.52 (s, 2H), 3.89 (s, 3H), 3.84 (s, 3H).

Step 3: 6-Chloro-9-(2-fluoro-4,5-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2-fluoro-4,5-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 4.939 min. ¹H-NMR (CDCl₃): δ 7.79 (s, 1H), 6.88–6.85 (d, 1H), 6.69–6.66 (d, 1H), 5.22 (s, 2H), 5.12 (s, 2H), 3.89 (s, 3H), 3.82 (s, 3H).

Example 72 6-chloro-9-(2,3-dimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: 1-Bromomethyl-2,3-dimethoxy-benzene

The title compound was obtained from (2,3-dimethoxy-phenyl)-methanol according to the general procedure 2.5. ¹H-NMR (CDCl₃): δ 7.02–7.08 (t, 1H), 6.95–6.98 (dd, 1H), 6.87–6.91 (dd, 1H), 4.57 (s, 2H), 3.92 (s, 3H), 3.86 (s, 3H).

Step 2: 6-Chloro-9-(2,3-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2,3-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.200. ¹H-NMR (CDCl₃): δ 7.81 (s, 1H), 7.02–7.08 (t, 1H), 6.95–6.98(dd, 1H), 6.87–6.91 (dd, 1H), 5.28 (s, 2H), 5.12 (s, 2H), 3.92 (s, 3H), 3.87 (s, 3H).

Example 73 6-chloro-9-(3,4-dimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: 4-Bromomethyl-1,2-dimethoxy-benzene

The title compound was obtained from (3,4-dimethoxy-phenyl)-methanol according to the general procedure 2.5. ¹H-NMR (CDCl₃): δ 6.95–6.98 (dd, 1H), 6.92–6.94 (d, 1H), 6.78–6.81 (d, 1H), 4.51 (s, 2H), 3.92 (s, 3H), 3.86 (s, 3H).

Step 2: 6-Chloro-9-(3,4-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 4-bromomethyl-1,2-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 4.753. ¹H-NMR (CDCl₃): δ 7.71 (s, 1H), 6.87 (s, 2H), 6.82 (s, 1H), 5.20 (s, 2H), 5.12 (s, 2H), 3.92 (s, 3H), 3.87 (s, 3H).

Example 74 9-(2-chloro-3,4,5-trimethoxy-benzyl)-6-methyl-9H-purin-2-ylamine

A suspension of 6-chloro-9-(2-chloro-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine, see example 97) (0.2 mmol) and tetrakis(triphenylphosphino)-palladium (0.02 mmol) in dry THF (3 mL) was treated with trimethylaluminum (2M in toluene, 0.45 mmol) under nitrogen and heated to reflux for 3 h. The reaction mixture was cooled to r.t., diluted with toluene (5 mL) and quenched with methanol (0.5 mL) followed by ammonium chloride (1 mmol). The mixture was heated to reflux for 2 h and filtered, while hot, on Celite. See J. Med. Chem. 1999, 42, 2064–2086. TLC (100% EtOAc) Rf was 0.2. HPLC Rt: 4.800 min.

Example 75 6-chloro-9-(2-chloro-4,5-dimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: (2-Chloro-4,5-dimethoxy-phenyl)-methanol

The title compound was obtained by chlorination of (3,4-dimethoxy-phenyl)-methanol according to the general procedure 3.1. ¹H-NMR (CDCl₃): δ 7.01 (s, 1H), 6.88 (s, 1H), 4.75–4.73 (d, 2H), 3.91 (s, 3H), 3.90 (s, 3H), 1.95–1.92 (t, 1H).

Step 2: 1-Bromomethyl-2-chloro-4,5-dimethoxy-benzene

The title compound was obtained from (2-chloro-4,5-dimethoxy-phenyl)-methanol according to the general procedure 2.5. ¹H-NMR (CDCl₃): δ 6.92 (s, 1H), 6.88 (s, 1H), 4.60 (s, 2H), 3.91 (s, 3H), 3.90 (s, 3H).

Step 3: 6-Chloro-9-(2-chloro-4,5-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2-chloro-4,5-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.366 min. ¹H-NMR (CDCl₃): δ 7.81 (s, 1H), 7.28 (s, 1H), 6.92 (s, 1H), 5.30 (s, 2H), 5.15 (s, 2H), 3.90 (s, 3H), 3.84 (s, 3H).

Example 76 6-chloro-9-(2-iodo-4,5-dimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: 4-Bromomethyl-1,2-dimethoxy-benzene

The title compound was obtained from (3,4-dimethoxy-phenyl)-methanol according to the general procedure 2.5. ¹H-NMR (CDCl₃): δ 6.95–6.98 (dd, 1H), 6.92–6.94 (d, 1H), 6.78–6.81 (d, 1H), 4.51 (s, 2H), 3.92 (s, 3H), 3.86 (s, 3H).

Step 2: 1-Bromomethyl-2-iodo-4,5-dimethoxy-benzene

The title compound was obtained by iodination of 4-bromomethyl-1,2-dimethoxy-benzene according to the general procedure 3.1. ¹H-NMR (CDCl₃): δ 7.04 (s, 1H), 6.95 (s, 1H), 4.61 (s, 2H), 3.91 (s, 3H), 3.90 (s, 3H).

Step 3: 6-Chloro-9-(2-iodo-4,5-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2-iodo-4,5-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.470 min. ¹H-NMR (CDCl₃): δ 7.84 (s, 1H), 7.08 (s, 1H), 6.93 (s, 1H), 5.30 (s, 2H), 5.15 (s, 2H), 3.91 (s, 3H), 3.82 (s, 3H).

Example 77 6-Bromo-9-(2-chloro-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: 2-Chloro-1-chloromethyl-3,4,5-trimethoxy-benzene

The title compound was obtained by chlorination of 5-chloromethyl-1,2,3-trimethoxy-benzene according to the general procedure 3.1. ¹H-NMR (CDCl₃): δ 6.82 (s, 1H), 4.70 (s, 1H), 3.93 (s, 3H), 3.90 (s, 3H) 3.87 (s, 3H).

Step 2: Synthesis of 6-chloro-9-(2-chloro-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 6-bromoguanine with 2-chloro-1-chloromethyl-3,4,5-trimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.676 min. ¹H-NMR (CDCl₃): δ 7.82 (s, 1H), 6.70 (s, 1H), 5.32 (s, 2H), 5.15 (s, 2H), 3.93 (s, 3H), 3.91 (s, 3H) 3.79 (s, 3H).

Example 78 6-chloro-9-(6-chloro-benzo[1,3]dioxol-5-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 5-chloro-6-chloromethyl-benzo[1,3]dioxole according to the general procedure 1.1. HPLC Rt: 5.506 min. ¹H-NMR (CDCl₃): δ 7.81 (s, 1H), 6.88 (s, 1H), 6.79 (s, 1H), 5.98 (s, 2H), 5.25 (s, 2H), 5.13 (s, 2H).

Example 79 6-chloro-9-(2,4-dimethoxy-3-methyl-benzyl)-9H-purin-2-ylamine

Step 1: 1-Bromomethyl-2,4-dimethoxy-3-methyl-benzene

The title compound was obtained from (2,4-dimethoxy-3-methyl-phenyl)-methanol according to the general procedure 2.5.

Step 2: 6-Chloro-9-(2,4-dimethoxy-3-methyl-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2,4-dimethoxy-3-methyl-benzene according to the general procedure 1.1. HPLC Rt: 5.433 min. ¹H-NMR (CDCl₃): δ 7.76 (s, 1H), 7.08–7.06 (d, 1H), 6.60–6.62 (d, 1H), 5.20 (s, 2H), 5.07 (s, 2H), 3.82 (s, 3H), 3.72 (s, 3H), 2.17 (s, 3H).

Example 80 6-Chloro-9-(2-chloro-3,4-dimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: 1-Bromomethyl-2-chloro-3,4-dimethoxy-benzene

The title compound was obtained from (2-chloro-3,4-dimethoxy-phenyl)-methanol according to the general procedure 2.5.

Step 2: 6-Chloro-9-(2-chloro-3,4-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2-chloro-3,4-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.633 min. ¹H-NMR (CDCl₃): δ 7.80 (s, 1H), 7.00–6.98 (d, 1H), 6.82–6.79 (d, 1H), 5.31 (s, 2H), 5.08 (s, 2H), 3.88 (s, 3H), 3.88 (s, 3H).

Example 81 6-chloro-9-(3-methoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-3-methoxybenzene according to the general procedure 1.1. HPLC Rt: 5.136 min. ¹H-NMR (CDCl₃): δ 7.75 (s, 1H), 7.30–7.28 (m. 1H), 6.88–6.85 (dd, 1H), 6.84–6.82 (dd, 1H), 6.80–6.79 (m, 1H), 5.28 (s, 2H), 5.15 (s, 2H), 3.78 (s, 3H).

Example 82 6-Chloro-9-(2,6-dibromo-3,5-dimethoxy-benzyl)-9H-purin-2-ylamine

Step 1: 2-Bromo-1-chloromethyl-3,5-dimethoxy-benzene and 2,4-dibromo-3-chloromethyl-1,5-dimethoxy-benzene

Bromination of 1-chloromethyl-3,5-dimethoxy-benzene according to the general procedure 3.1 gave a mixture of the two title compounds, which were separated by flash chromatography. ¹H-NMR of 2,4-dibromo-3-chloromethyl-1,5-dimethoxy-benzene (CDCl3): δ 6.52 (s, 1H), 5.02 (s, 2H), 3.93 (s, 6H). 2-bromo-1-chloromethyl-3,5-dimethoxy-benzene ¹H-NMR (CDCl₃): δ 6.67–6.67 (d, 1H), 6.47–6.46 (d, 1H), 4.80 (s, 2H), 3.85 (s, 3H), 3.82 (s, 3H).

Step 2: 6-Chloro-9-(2,6-dibromo-3,5-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2,4-dibromo-3-chloromethyl-1,5-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 6.022 min. ¹H-NMR (CDCl₃): δ 7.46 (s, 1H), 6.64 (s, 1H), 5.64 (s, 2H), 5.14 (s, 2H), 3.99 (s, 6H).

Example 83 9-(2-Bromo-3,5-dimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromo-1-chloromethyl-3,5-dimethoxy-benzene (see previous example, step 1) according to the general procedure 1.1. HPLC Rt: 6.026 min. ¹H-NMR (CDCl₃): δ 7.82 (s, 1H), 6.48–6.47 (d, 1H), 6.32–6.32 (d, 1H), 5.35 (s, 2H), 5.09 (s, 2H), 3.90 (s, 3H), 3.73 (s, 3H).

Example 84 6-chloro-9-(3,5-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-chloromethyl-3,5-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.257 min. ¹H-NMR (CDCl₃): δ 7.79 (s, 1H), 6.44–6.42 (t, 1H), 6.41–6.39 (d, 2H), 5.22 (s, 2H), 5.15 (s, 2H), 3.80 (s, 6H).

Example 85 N-[6-chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-yl]-acetamide

A solution of 6-chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine in acetic acid was treated with fuming HNO₃ at 0° C. for 15 min. Work-up and preparative TLC (EtOAc:hexane 1:1) gave N-[6-chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-yl]-acetamide. HPLC Rt: 5.744 min. ¹H-NMR (CDCl₃): δ 8.09 (s, 1H), 6.58 (s, 2H), 5.33 (s, 2H), 3.85 (s, 3H), 3.85 (s, 6H), 2.43 (s, 3H).

Example 86 6-chloro-9-(2,5-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-chloromethyl-2,5-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.291 min. ¹H-NMR (CDCl₃): δ 7.82 (s, 1H), 6.85–6.84 (d, 1H), 6.82–6.82 (d, 2H), 5.18 (s, 2H), 5.16 (s, 2H), 3.80 (s, 3H), 3.75 (s, 3H).

Example 87 8-bromo-6-chloro-9-(2,5-dimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by bromination of 6-chloro-9-(2,5-dimethoxy-benzyl)-9H-purin-2-ylamine according to the general procedure 1.2. HPLC Rt: 6.150 min. ¹H-NMR (CDCl₃): δ 6.83–6.78 (m, 2H), 6.37–6.36 (d, 1H), 5.31 (s, 2H), 5.13 (s, 2H), 3.83 (s, 3H), 3.70 (s, 3H).

Example 88 6-chloro-9-(4,5-dimethoxy-2-nitro-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-4,5-dimethoxy-2-nitro-benzene according to the general procedure 1.1. HPLC Rt: 5.194 min. ¹H-NMR (CDCl₃): δ 7.98 (s, 1H), 7.74 (s, 1H), 6.79 (s, 1H), 5.67 (s, 2H), 5.15 (s, 2H), 3.98 (s, 3H), 3.85 (s, 3H).

Example 89 8-bromo-6-chloro-9-(4,5-dimethoxy-2-nitro-benzyl)-9H-purin-2-ylamine

The title compound was obtained by brominating 6-chloro-9-(4,5-dimethoxy-2-nitro-benzyl)-9H-purin-2-ylamine (see previous example) according, to the general procedure 1.2. HPLC Rt: 6.040 min. ¹H-NMR (CDCl₃): δ 7.74 (s, 1H), 6.13 (s, 1H), 5.78 (s, 2H), 5.16 (s, 2H), 3.99 (s, 3H), 3.71 (s, 3H).

Example 90 6-chloro-9-(2,5-dichloro-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-1,4-dichloro-benzene according to the general procedure 1.1. HPLC Rt: 5.846 min. ¹H-NMR (CDCl₃): δ 7.82 (s, 1H), 7.38–7.36 (d, 1H), 7.28–7.26 (dd, 1H), 7.18–7.18 (d, 1H), 5.32 (s, 2H), 5.17 (s, 2H).

Example 91 6-chloro-9-(2,3,5-trifluoro-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2,3,5-trifluoro-benzene according to the general procedure 1.1. HPLC Rt: 5.414 min. ¹H-NMR (CDCl₃): δ 7.82 (s, 1H), 6.98–6.89 (m, 1H), 6.82–6.75 (m. 1H), 5.30 (s, 2H), 5.13 (s, 2H).

Example 92 (2-amino-6-chloro-purin-9-yl)-(3,4,5-trimethoxy-phenyl)-methanone

A solution of 6-chloro-9H-purin-2-ylamine in pyridine was treated with 3,4,5-trimethoxybenzoyl chloride at r.t. for 2 h. Work-up and purification by preparative TLC (EtOAc:hexane 1:1) gave the title compound. HPLC Rt: 5.305 min. ¹H-NMR (CDCl₃): δ 8.24 (s, 1H), 7.13 (s, 2H), 5.36 (s, 2H), 3.99 (s, 3H), 3.88 (s, 6H).

Example 93 N-[9-(2-Bromo-3,4,5-trimethoxy-benzyl)-6-chloro-9H-purin-2-yl]-acetamide

A suspension of 9-(2-bromo-3,4,5-trimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine (example 51) in acetic anhydride was treated with a catalytic amount of conc. H₂SO₄ at r.t. for 3 h. Work-up and purification by preparative TLC (EtOAc:hexane 9:1) gave the title compound. HPLC Rt: 5.603 min. ¹H-NMR (CDCl₃): δ 8.20 (s, 1H), 8.10 (s, 1H), 7.00 (s, 1H), 5.47 (s, 2H), 3.92 (s, 3H), 3.90 (s, 3H), 3.86 (s, 3H), 2.51 (s, 3H).

Example 94 N-[9-(2-bromo-3,4,5-trimethoxy-benzyl)-6-chloro-9H-purin-2-yl]-N-methyl-acetamide

A mixture of N-[9-(2-bromo-3,4,5-trimethoxy-benzyl)-6-chloro-9H-purin-2-yl]-acetamide and NaH in DMF was stirred at r.t. for 15 min, before adding MeI. Stirring was prolonged for 2 h at 50° C. Work-up and purification by preparative TLC (EtOAc:hexane 1:1) gave the title compound. HPLC Rt: 6.422 min. ¹H-NMR (CDCl₃): δ 8.20 (s, 1H), 6.80 (s, 1H), 5.45 (s, 2H), 3.93 (s, 3H), 3.90 (s, 3H), 3.82 (s, 3H), 3.57 (s, 3H), 2.51 (s, 3H).

Example 95 6-chloro-9-(3,5-dichloro-benzyl)-9H-purin-2-ylamine

Step 1: 1-Bromomethyl-3,5-dichloro-benzene

The title compound was obtained from (3,5-dichloro-phenyl)-methanol according to the general procedure 2.5.

Step 2: 6-chloro-9-(3,5-dichloro-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-3,5-dichloro-benzene. HPLC Rt: 6.074 min. ¹H-NMR (Acetone-d₆): δ 8.12 (s, 1H), 7.45–7.43 (t, 1H), 7.72–7.42 (d, 2H), 6.30 (s, 2H), 5.40 (s, 2H).

Example 96 6-chloro-9-(3,4-dichloro-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 4-bromomethyl-1,2-dichloro-benzene according to the general procedure 1.1. HPLC Rt: 5.982 min. ¹H-NMR (CDCl₃): δ 7.76 (s, 1H), 7.48–7.45 (d, 1H), 7.40–7.39 (d, 1H), 7.12–7.10 (dd, 1H), 5.23 (s, 2H), 5.12 (s, 2H).

Example 97 8-bromo-6-chloro-9-(3,4-dichloro-benzyl)-9H-purin-2-ylamine

The title compound was obtained by bromination of 6-chloro-9-(3,4-dichloro-benzyl)-9H-purin-2-ylamine (see previous example) according to the general procedure 1.2. HPLC Rt: 6.878 min. ¹H-NMR (CDCl₃): δ 7.45–7.43 (m, 2H), 7.17–7.14 (dd, 1H), 5.23 (s, 2H), 5.12 (s, 2H).

Example 98 6-chloro-9-(2-chloro-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

Chlorination of 6-chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine according to the general procedure 3.1 gave a mixture of the title compound and of 6-chloro-9-(2,6-dichloro-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine. The two compounds were isolated by preparative TLC. HPLC Rt: 5.626 min. ¹H-NMR (CDCl₃): δ 7.83 (s, 1H), 6.68 (s, 1H), 5.51 (s, 2H), 5.23 (s, 2H), 3.94 (s, 3H), 3.90 (s, 3H), 3.80 (s, 3H).

Example 99 6-chloro-9-(2,6-dichloro-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

See the previous example. HPLC Rt: 6.099 min. ¹H-NMR (CDCl₃): δ 7.57 (s, 1H), 5.48 (s, 2H), 5.12 (s, 2H), 3.99 (s, 3H), 3.92 (s, 6H).

Example 100 2-amino-9-(2-chloro-3,4,5-trimethoxy-benzyl)-9H-purin-6-ol

The title compound was obtained by heating a solution of 6-chloro-9-(2-chloro-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine (see example 98) in 1N HCl for 4 h. Solvent was evaporated and the residue was washed with EtOAc to give the title compound. HPLC Rt: 4.603 min. ¹H-NMR (DMSO-d₆): δ 7.82 (s, 1H), 6.65 (s, 1H), 6.60 (s, 2H), 5.15 (s, 2H), 3.81 (s, 3H), 3.77 (s, 3H), 3.69 (s, 3H).

Example 101 6-bromo-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 6-bromoguanine with 3-chloromethyl-3,4,5-trimethoxy benzene according to the general procedure 1.1. HPLC Rt: 4.947 min. ¹H-NMR (CDCl₃): δ 7.80 (s, 1H), 6.50 (s, 2H), 5.20 (s, 2H), 5.18 (s, 2H), 3.85 (s, 3H), 3.84 (s, 6H).

Example 102 6-bromo-9-(2-bromo-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by bromination of 6-bromo-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine (see previous example) according to the general procedure 3.1. HPLC Rt: 5.793 min. ¹H-NMR (CDCl₃): δ 7.88 (s, 1H), 6.68 (s, 1H), 5.33 (s, 2H), 5.19 (s, 2H), 3.93 (s, 3H), 3.90 (s, 3H), 3.79 (s, 3H).

Example 103 9-(2-bromo-3,4,5-trimethoxy-benzyl)-6-ethylsulfanyl-9H-purin-2-ylamine

A mixture of 6-bromo-9-(2-bromo-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine (see previous example), EtSH, K₂CO₃ and THF was placed in a pressure vessel and heated to 70° C. for 6 h. Work-up and purification by preparative TLC (EtOAc:hexane 1:1) gave the title compound. HPLC Rt: 6.039 min. ¹H-NMR (CDCl₃): δ 7.72 (s, 1H), 6.62 (s, 1H), 5.30 (s, 2H), 4.98 (s, 2H), 3.91 (s, 3H), 3.88 (s, 3H), 3.74 (s, 3H), 3.35–3.29 (q, 2H), 1.44–1.41 (t, 3H).

Example 104 9-(2-bromo-3,4,5-trimethoxy-benzyl)-6-methoxy-9H-purin-2-ylamine

A solution of 9-(2-bromo-3,4,5-trimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine (see example 51) in MeOH was treated with MeONa at reflux for 1 h. Work-up and purification by preparative TLC (EtOAc:hexane 1:1) gave the title compound. HPLC Rt: 5.229 min. ¹H-NMR (CDCl₃): δ 7.69 (s, 1H), 6.58 (s, 1H), 5.33 (s, 2H), 4.88 (s, 2H), 4.11 (s, 3H), 3.93 (s, 3H), 3.89 (s, 3H), 3.74 (s, 3H).

Example 105 9-(2-bromo-3,4,5-trimethoxy-benzyl)-9H-purine-2,6-diamine

A solution of 9-(2-bromo-3,4,5-trimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine (see example 51) in MeOH was treated with NH₃ (7N in MeOH) in a pressure vessel at 90° C. for 16 h. Work-up and purification by preparative TLC (EtOAc:hexane 3:1) gave the title compound. HPLC Rt: 4.884 min. ¹H-NMR (DMSO-d₆): δ 7.67 (s, 1H), 6.71 (s, 2H), 6.60 (s, 1H), 5.84 (s, 2H), 5.17 (s, 2H), 3.80 (s, 3H), 3.76 (s, 3H), 3.66 (s, 3H).

Example 106 6-chloro-9-(2-iodo-3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by iodination of 6-chloro-9-(3,4,5-trimethoxy-benzyl)-9H-purin-2-ylamine (see example 48) according to the general procedure 3.1. HPLC Rt: 5.887 min. ¹H-NMR (CDCl₃): δ 7.87 (s, 1H), 6.67 (s, 1H), 5.33 (s, 2H), 5.22 (s, 2H), 3.91 (s, 3H), 3.88 (s, 3H), 3.77 (s, 3H).

Example 107 9-(2-bromo-3,5-dimethoxy-4-methoxymethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 4-(2-amino-6-chloro-purin-9-ylmethyl)-3-bromo-2,6-dimethoxy-phenol (see example 50) chloromethyl methyl ether according to the general procedure 2.6 (NaOH, THF, r.t.) HPLC Rt: 5.817 min. ¹H-NMR (CDCl₃): δ 7.90 (s, 1H), 6.70 (s, 1H), 5.35 (s, 2H), 5.32 (s, 2H), 5.17 (s, 2H), 3.93 (s, 3H), 3.78 (s, 3H), 3.62 (s, 3H).

Example 108 9-benzothiazol-2-ylmethyl-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-benzothiazole according to the general procedure 1.1. HPLC Rt: 5.055 min. ¹H-NMR (DMSO-d₆): δ 8.34 (s, 1H), 8.09–8.07 (dd, 1H), 7.98–7.96 (d, 1H), 7.53–7.50 (m, 1H), 7.47–7.43 (m, 1H), 7.01 (s, 2H), 5.81 (s, 2H).

Example 109 6-chloro-9-(4-methoxy-benzyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-chloromethyl-4-methoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.067 min. ¹H-NMR (CDCl₃): δ 7.69 (s, 1H), 7.22–7.20 (d, 2H), 6.88–6.86 (d, 2H), 5.22 (s, 2H), 5.17 (s, 2H), 3.79 (s, 3H).

Example 110 9-(2-bromo-4,5-dimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

Step 1: (2-Bromo-4,5-dimethoxy-phenyl)-methanol

The title compound was obtained by bromination of (3,4-dimethoxy-phenyl)-methanol according to the general procedure 3.1. ¹H-NMR (CDCl₃): δ 7.03 (s, 1H), 7.03 (s, 1H), 4.70 (s, 2H), 3.91 (s, 3H), 3.89 (s, 3H)

Step 2: 1-Bromomethyl-2-chloro-4,5-dimethoxy-benzene

The title compound was obtained from (2-bromo-4,5-dimethoxy-phenyl)-methanol according to the general procedure 2.5. ¹H-NMR (CDCl₃): δ 7.03 (s, 1H), 6.94 (s, 1H), 4.60 (s, 2H), 3.89 (s, 3H), 3.86 (s, 3H)

Step 3: 9-(2-Bromo-4,5-dimethoxy-benzyl)-6-chloro-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 1-bromomethyl-2-chloro-4,5-dimethoxy-benzene according to the general procedure 1.1. HPLC Rt: 5.458 min. ¹H-NMR (CDCl₃): δ 7.84 (s, 1H), 7.08 (s, 1H), 6.93 (s, 1H), 5.30 (s, 2H), 5.15 (s, 2H), 3.90 (s, 3H), 3.82 (s, 3H).

Example 111 6-Chloro-9-(4-iodo-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: 2,3,5-Collidine-N-oxide

The title compound was obtained by oxidation of 2,3,5-collidine according to the general procedure 2.1 (yield 70%). HPLC Rt: 3.964 min. ¹H-NMR (CDCl₃): δ 8.03 (s, 1H), 6.90 (s, 1H), 2.47 (s, 3H), 2.31 (s, 3H), 2.24 (s, 3H). m/z (%) 138.2 (M+1, 100%). Rf (20% MeOH/EtOAc) was 0.35.

Step 2: 2,3,5-Trimethyl-4-nitro-pyridine 1-oxide

A suspension of 2,3,5-collidine-N-oxide (3.77 g, 28 mmol) in conc. H₂SO₄ (8 mL) was cooled to 0° C. and fuming HNO₃ (5 mL, 100 mmol) was added dropwise. The resulting transparent solution was stirred at 100° C. for 24 h, cooled to r.t., poured onto ice, and the pH was adjusted to 10. Work-up (CHCl₃), drying (MgSO₄), and evaporation gave the title compound, (97% yield, 97% purity). Rf (MeOH/EtOAc 1:9): 0.7. HPLC Rt: 4.756 min. ¹H-NMR (CDCl₃): δ 8.08 (s, 1H), 2.50 (s, 3H), 2.27 (s, 3H), 2.23 (s, 3H). m/z (%) 183.1 (M+1, 100%).

Step 3: 2,3,5-Trimethyl-pyridin-4-ylamine-1-oxide hydrochloride

A suspension of 2,3,5-trimethyl-4-nitro-pyridine 1-oxide (4.2 g, 23 mmol) and 10% Pd/C (0.42 g) in conc. aq. HCl/EtOH (1:11) was treated with H₂ (60 psi) at r.t. for 3 h. Filtration and evaporation gave the title compound as a slightly yellow solid. HPLC Rt: 4.756 min. ¹H-NMR (DMSO-d₆): δ 8.28 (s, 1H), 7.24 (s, 2H), 2.50 (s, 3H), 2.12 (s, 3H), 2.11 (s, 3H). m/z (%) 153.2 (M+1, 100%).

Step 4: 4-Iodo-2,3,5-trimethyl-pyridine-1-oxide

A solution of 2,3,5-Trimethyl-pyridin-4-ylamine-1-oxide hydrochloride (1.9 g, 10 mmol) HBF₄ (20 mmol) in water (50 mL) was cooled to 0° C. A solution of NaNO₂ (0.76 g, 11 mmol) in water (5 mL) was added dropwise to give a dark yellow solution which gradually gave a precipitate within 15 min. Potassium iodide (2.3 g, 1.39×10⁻² mol) was added slowly in several portion to give a dark brown precipitate. The reaction mixture was stirred at r.t. for 5 min, and then heated to 60° C. for 10 min. The mixture was cooled to r.t. and the pH was adjusted to 10. Work-up (CHCl₃), drying (MgSO₄), evaporation, and flash chromatography gave the title compound. HPLC Rt: 5.579 min. ¹H-NMR (CDCl₃): δ 8.07 (s, 1H), 2.62 (s, 3H), 2.56 (s, 3H), 2.38 (s, 3H). m/z (%) 264.1 (M+1, 100%).

Step 5: Acetic acid 4-iodo-3,5-dimethyl-pyridin-2-ylmethyl ester

The title compound was obtained by treating 4-iodo-3,5-dimethyl-pyridine 1-oxide was with Ac₂O according to the general procedure 2.2. HPLC Rt: 2.913 min. ¹H-NMR (CDCl3): δ 8.26 (s, 1H), 5.32 (s, 2H), 2.47 (s, 3H), 2.41 (s, 3H), 2.24 (s, 3H). m/z (%) 306.0 (M+1, 100%).

Step 6: (4-Iodo-3,5-dimethyl-pyridin-2-yl)-methanol

The title compound was obtained by deacetylation of 4-iodo-3,5-dimethyl-pyridin-2-ylmethyl ester according to the general procedure 2.3. HPLC Rt: 3.773 min. ¹H-NMR (CDCl₃): δ 8.15 (s, 1H), 4.70 (s, 2H), 2.46 (s, 3H), 2.40 (s, 3H). m/z (%) 264.1 (M+1, 100%).

Step 7: 2-Bromomethyl-4-iodo-3,5-dimethyl-pyridine

The title compound was obtained from (4-Iodo-3,5-dimethyl-pyridin-2-yl)-methanol according to the general procedure 2.5. HPLC Rt: 5.957 min. ¹H-NMR (CDCl₃): δ 8.14 (s, 1H), 4.67 (s, 2H), 2.59 (s, 3H), 2.45 (s, 3H). m/z (%) 326.07 (M+1, 100%), 328.07 (M+1, 100%).

Step 8: 6-Chloro-9-(4-iodo-3,5-dimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-4-iodo-3,5-dimethyl-pyridine according to the general procedure 1.1. HPLC Rt: 5.361 min. ¹H-NMR (CDCl₃): δ 8.08 (s, 1H), 7.86 (s, 1H), 5.41 (s, 2H), 5.04 (s, 2H), 2.57 (s, 3H), 2.41 (s, 3H).

Example 112 6-chloro-9-(4-methyl-quinolin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: 2,4-Dimethyl-quinoline 1-oxide:

The title compound was obtained by oxidation of 2,4-dimethyl-quinoline according to the general procedure 2.1. HPLC Rt: 4.489 min. ¹H-NMR (CDCl₃): δ, 8.89–8.07 (dd, 1H), 8.00–7.97 (dd, 1H), 7.82–7.79 (m, 1H), 7.69–7.65 (m, 1H), 7.20 (s, 1H), 2.73 (s, 3H), 2.69 (s, 3H).

Step 2: Acetic acid 4-methyl-quinolin-2-ylmethyl ester

The title compound was obtained by treating 2,4-dimethyl-quinoline-1-oxide with Ac₂O according to the general procedure 2.2. HPLC Rt: 3.158 min. Rf (EtOAc/Hexane 1:1): 0.8.

Step 3: (4-Methyl-quinolin-2-yl)-methanol

The title compound was obtained by deacetylation of acetic acid 4-methyl-quinolin-2-ylmethyl ester according to the general procedure 2.3. HPLC Rt: 3.715 min. ¹H-NMR (CDCl₃): δ, 8.08–8.06 (dd, 1H), 8.00–7.97 (dd, 1H), 7.73–7.69 (m, 1H), 7.57–7.54 (m, 1H), 7.12 (s, 1H), 4.87 (s, 2H), 4.52 (s, 1H), 2.70 (s, 3H).

Step 4: 2-bromomethyl-4-methyl-quinoline

The title compound was obtained from (4-methyl-quinolin-2-yl)-methanol according to the general procedure 2.5. HPLC Rt: 4.516 min. ¹H-NMR (CDCl₃): δ, 8.07–8.05 (dd, 1H), 7.98–7.96 (dd, 1H), 7.73–7.69 (m, 1H), 7.58–7.54 (m, 1H), 7.40 (d, 1H), 4.66 (s, 2H), 2.70 (s, 3H).

Step 5: 6-chloro-9-(4-methyl-quinolin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-4-methyl-quinoline according to the general procedure 1.1. HPLC Rt: 4.387 min. ¹H-NMR (DMSO-d6): δ 8.31 (s, 1H), 8.11–8.09 (dd, 1H), 7.90–7.88 (dd, 1H), 7.77–7.74 (m, 1H), 7.66–7.62 (m, 1H), 7.27 (s, 1H), 6.91 (s, 2H) 5.58 (s, 2H), 2.68 (s, 3H).

Example 113 6-bromo-9-(4-methyl-quinolin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 6-bromoguanine with 2-bromomethyl-4-methyl-quinoline (see previous example) according to the general procedure 1.1. HPLC Rt: 4.489 min. ¹H-NMR (DMSO-d6): δ 8.27 (s, 1H), 8.06–8.04 (dd, 1H), 7.85–7.83 (dd, 1H), 7.73–7.69 (m, 1H), 7.61–7.57 (m, 1H), 7.22 (s, 1H), 6.89 (s, 2H), 5.52 (s, 2H), 2.64 (s, 3H).

Example 114 6-bromo-9-(4-methyl-1-oxy-quinolin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by oxidation of 6-bromo-9-(4-methyl-quinolin-2-ylmethyl)-9H-purin-2-ylamine (see previous example) according to the general procedure 2.1. HPLC Rt: 4.698 min. ¹H-NMR (DMSO-d6): δ 8.62–8.60 (dd, 1H), 8.27 (s, 1H), 8.12–8.10 (dd, 1H), 7.88–7.85 (m, 1H), 7.79–7.75 (m, 1H), 6.93 (s, 2H), 6.89 (s, 1H) 5.57 (s, 2H), 2.64 (s, 3H).

Example 115 6-chloro-9-(3,5-dimethyl-4-methylsulfanyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: 2,3,5-Trimethyl-4-methylsulfanyl-pyridine 1-oxide

A solution of 4-bromo-2,3,5-trimethyl-pyridine 1-oxide in THF was treated in a pressure vessel with NaSMe at 110° C. for 16 h. HPLC Rt: 5.303 min. ¹H-NMR (CDCl₃): δ 8.07 (s, 1H), 2.57 (s, 3H), 2.52 (s, 3H), 2.42 (s, 3H), 2.23 (s, 3H).

Step 2: Acetic acid 3,5-dimethyl-4-methylsulfanyl-pyridin-2-ylmethyl ester

The title compound was obtained by treating 2,3,5-trimethyl-4-methylsulfanyl-pyridine 1-oxide with Ac₂O according to the general procedure 2.2. HPLC Rt: 4.341 min. ¹H-NMR (CDCl₃): δ 8.27 (s, 1H), 5.20 (s, 2H), 2.57 (s, 3H), 2.46 (s, 3H), 2.25 (s, 3H), 2.10 (s, 3H).

Step 3: (3,5-Dimethyl-4-methylsulfanyl-pyridin-2-yl)-methanol

The title compound was obtained by deacetylation of acetic acid 3,5-dimethyl-4-methylsulfanyl-pyridin-2-ylmethyl ester according to the general procedure 2.3. HPLC Rt: 3.921 min.

Step 4: 2-Bromomethyl-3,5-dimethyl-4-methylsulfanyl-pyridine

The compound was obtained from (3,5-dimethyl-4-methylsulfanyl-pyridin-2-yl)-methanol according to the general procedure 2.5. HPLC Rt: 4.905 min. ¹HNMR (CDCl₃): δ 8.26 (s, 1H), 4.59 (s, 2H), 2.62 (s, 3H), 2.47 (s, 3H), 2.27 (s, 3H), 2.10 (s, 3H). m/z (%): 246.13 (M+1, 96%), 248.09 (M+3, 100%).

Step 5: 6-Chloro-9-(3,5-dimethyl-4-methylsulfanyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The title compound was obtained by alkylation of 2-amino-6-chloropurine with 2-bromomethyl-3,5-dimethyl-4-methylsulfanyl-pyridine according to the general procedure 1.1. HPLC Rt: 4.611 min. ¹H-NMR (CDCl₃): δ 8.24 (s, 1H), 7.87 (s, 1H), 5.36 (s, 2H), 5.00 (s, 2H), 2.61 (s, 3H), 2.47 (s, 3H), 2.26 (s, 3H).

Example 116 6-chloro-9-(7-chloro-benzothiazol-2-ylmethyl)-9H-purin-2-ylamine

Step 1: (2,3-dichloro-phenyl)-acetamide

A solution of 2,3-dichloroaniline (5.00 g, 30.86 mmol) in pyridine (20 ml) was cooled to 0° C. and treated with AcCl (4.85 g, 62 mmol). The reaction mixture was stirred at r.t. for 1 h and then concentrated under reduced pressure. The residue was dissolved in ethyl acetate, washed with 1% aqueous hydrochloric acid, water and brine, and dried over MgSO₄. The solution was concentrated and recrystallized from EtOAc/hexane to give (2,3-dichloro-phenyl)-acetamide (4.50 g, 22 mmol). HPLC Rt: 5.52 min. ¹H-NMR (CDCl₃): δ 8.35 (br. s, 1H), 7.7 (1H), 7.24 (1H), 7.23 (1H), 2.28 (s, 3H).

Step 2: (2,3-dichloro-phenyl)-thioacetamide

A solution of (2,3-dichloro-phenyl)-acetamide (4.50 g, 22 mmol,) in toluene (50 ml) was treated at r.t. with P₂S₅ (9.80 g, 22 mmol). The reaction mixture was heated to 90° C. for 1.5 h, cooled to r.t., and filtered. The solid was washed with ether and the washings were combined with the filtrate. The combined solutions were extracted twice with 10% aq. NaOH. The combined aqueous extracts were acidified at 0° C. with HCl. The precipitate was collected and recrystallized from ethyl acetate/hexane to afford (2,3-dichloro-phenyl)-thioacetamide (3.40 g, 16 mmol). HPLC Rt: 5.91 min. ¹H-NMR (CDCl₃): δ 8.80 (br. s, 1H, NH), 8.5 (d, 1H), 7.42 (d, 1H), 7.30 (t, 1H), 2.82 (s, 3H).

Step 3: 7-Chloro-2-methyl-benzothiazole

A solution of (2,3-dichloro-phenyl)-thioacetamide (3.4 g, 15 mmol) in N-methyl-2-pyrrolidinone (25 ml) was treated with NaH (60% oil suspension, 0.74 g, 19 mmol) at r.t. The reaction mixture was heated to 150° C. for 30 min. Work-up (EtOAc), drying (brine, MgSO₄), evaporation, and purification by flash chromatography afforded the title compound (2.4 g, 13 mmol). HPLC Rt: 6.65 min. ¹H-NMR (CDCl3): δ 7.87 (d, 1H, J=7.9 Hz, ph-H), 7.44 (t, 1H, J=7.9 Hz, ph-H), 7.35 (d, 1H, J=8.0 Hz, ph-H), 2.87 (s, 3H, CH₃).

Step 4: 2-Bromomethyl-7-chloro-benzothiazole

A mixture of 7-chloro-2-methyl-benzothiazole (1.00 g, 5.45 mmol), N-bromosuccinimide (1.26 g, 7.08 mmol), benzoyl peroxide (0.1 g), and CCl₄ (10 mL was heated to reflux under irradiation of a UV lamp for 14 h. The reaction mixture was cooled and filtered to remove the succinimide formed in the reaction, and the filtrate was evaporated to dryness. The resulting solid was purified by flash chromatography to give the title lamp (400 mg, 1.5 mmol). ¹H-NMR (CDCl₃): δ 7.94 (d, 1H), 7.47 (t, 1H), 7.42 (d, 1H), 4.82 (s, 2H, CH₂). HPLC Rt: 7.19 min.

Step 5: 6-Chloro-9-(7-chloro-benzothiazol-2-ylmethyl)-9H-purin-2-ylamine

A mixture of 2-bromomethyl-7-chloro-benzothiazole (60 mg, 0.2286 mmol), 2-amino-6-chloropurine (32 mg, 0.19 mmol), Cs₂CO₃ (67.86 mg, 0.208 mmol), and DMF (2 ml) was heated to 40° C. for 1 h. The reaction was cooled to r.t. and the solvent was removed on a rotary evaporator. The resulting solid was purified by preparative TLC to give the title compound (50 mg, 0.14 mmol). HPLC Rt: 5.81 min. ¹H-NMR (CDCl₃): δ 8.0 (s, 1H), 7.95 (d, 1H), 7.48 (t, 1H), 7.43 (d, 1H), 5.69 (s, 2H), 5.17 (s, 2H).

Example 117 6-Chloro-9-(3,4,5-trimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

Step 1: 2,3,5-Collidine-N-oxide

See Example 1, Method 1, step 1.

Step 2: 4-Bromo-2,3,5-collidine-N-oxide

See Example 1, Method 1, step 2.

Step 3: 2,3,4,5-Tetramethyl-pyridine 1-oxide

4-Bromo-2,3,5-trimethyl-pyridine 1-oxide (2 g, 9.2 mmole) and catalytic tetrakis(triphenylphosphino)-palladium (80 mg, 4% by wt) in 20 mL of dry THF before treating with trimethylaluminum (2M in toluene, 15.2 mmole) under nitrogen. The solution was heated to reflux for 3 h, diluted with toluene (20 mL) before quenching the reaction with 4 mL of methanol followed by ammonium chloride (15 mmole). The mixture was refluxed for 2 h and filtered, while hot, on Celite. See J. Med. Chem. 1999, 42(12), 2064–2086. HPLC Rt: 4.183 min. ¹H-NMR (CDCl₃): δ 8.05 (s, 1H), 2.55 (s, 3H), 2.27 (s, 3H), 2.22 (s, 3H), 2.20 (s, 3H).

Step 4: Acetic acid 3,4,5-trimethyl-pyridin-2-ylmethyl ester

The compound was obtained by dissolving in acetic anhydride before bringing the reaction to reflux for 0.5 h as described in the general procedure 2.2. Quenching the reaction with water and extracting with chloroform yielded the titled product. HPLC Rt: 3.843 min. ¹H-NMR (CDCl₃): δ 8.20 (s, 1H), 5.22 (s, 2H), 2.26 (s, 3H), 2.25 (s, 3H), 2.21 (s, 3H).

Step 5: (3,4,5-Trimethyl-pyridin-2-yl)-methanol

The compound was obtained by hydrolysis of acetic acid 3,4,5-trimethyl-pyridin-2-ylmethyl ester in MeOH and K₂CO₃ at 50° C. for 0.5 h as described in the general procedure 2.3. After removing MeOH, the residue was dissolved in water and extracted with chloroform. HPLC Rt: 3.405 min. ¹H-NMR (CDCl₃): δ 8.18 (s, 1H), 5.00 (s, 1H), 4.67 (s, 2H), 2.28 (s, 3H), 2.23 (s, 3H), 2.12 (s, 3H).

Step 6: 2-bromomethyl-3,4,5-trimethyl-pyridine

The compound was obtained from reacting (3,4,5-trimethyl-pyridin-2-yl)-methanol with triphenyl phosphine and carbon tetrabromide in dichloromethane as described in the general procedure 2.5. HPLC Rt: 3.979 min. ¹H-NMR (CDCl₃): δ 8.18 (s, 1H), 4.63 (s, 2H), 2.35 (s, 3H), 2.48 (s, 3H), 2.24 (s, 3H).

Step 7: 6-Chloro-9-(3,4,5-trimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The compound was obtained by reacting 2-bromomethyl-3,4,5-trimethyl-pyridine with 6-chloro-9H-purin-2-ylamine in the presence of K₂CO₃ at 5° C. for 0.5 h as described in the general procedure 1.1. HPLC Rt: 3.903 min. ¹H-NMR (CDCl₃): δ 8.18 (s, 1H), 7.84 (s, 1H), 5.38 (s, 2H), 5.08 (s, 2H), 2.29 (s, 3H), 2.27 (s, 3H), 2.22 (s, 3H).

Example 118 6-Bromo-9-(3,4,5-trimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The compound was obtained by reacting 2-bromomethyl-3,4,5-trimethyl-pyridine (see example 117) with 6-bromo-9H-purin-2-ylamine in the presence of K₂CO₃ in DMF for 0.5 h at 50° C. as described in the general procedure 1.1. HPLC Rt: 4.045 min. ¹H-NMR (CDCl₃): δ 8.18 (s, 1H), 7.85 (s, 1H), 5.37 (s, 2H), 5.10 (s, 2H), 2.29 (s, 3H), 2.27 (s, 3H), 2.22 (s, 3H).

Example 119 6-Bromo-9-(3,4,5-trimethyl-1-oxy-pyridin-2-ylmethyl)-9H-purin-2-ylamine

The compound was obtained by the oxidation of 6-bromo-9-(3,4,5-trimethyl-pyridin-2-ylmethyl)-9H-purin-2-ylamine with m-CPBA in dichloromethane as described in the general procedure 2.1. HPLC Rt: 5.611 min. ¹H-NMR (CDCl₃): δ 9.13 (s, 1H), 8.08 (s, 1H), 5.91 (s, 2H), 2.70 (s, 3H), 2.27 (s, 3H), 2.22 (s, 3H).

Biology Examples Example A rHSP90 Competitive Binding Assay

Five microgram of purified rHSP90 protein (Stressgen, BC, Canada, #SPP-770) in phosphated buffered saline (PBS) was coated on 96 well plates by incubating overnight at 4° C. Unbound protein was removed and the coated wells were washed twice with 200 μL PBS. DMSO controls (considered as untreated samples) or test compounds were then added at 100–30–10–3–1–0.3 μM dilutions (in PBS), the plates mixed for 30 seconds on the plate shaker, and then incubated for 60 min. at 37° C. The wells were washed twice with 200 μL PBS, and 10 μM biotinylated-geldanamycin (biotin-GM) was added and incubated for 60 min. at 37° C. The wells were washed again twice with 200 μL PBS, before the addition of 20 μg/mL streptavidin-phycoerythrin (streptavidin-PE) (Molecular Probes, Eugene, Oreg.) and incubation for 60 min. at 37° C. The wells were washed again twice with 200 μL PBS. Relative fluorescence units (RFU) was measured using a SpectraMax Gemini XS Spectrofluorometer (Molecular Devices, Sunnyvale, Calif.) with an excitation at 485 nm and emission at 580 nm; data was acquired using SOFTmax®PRO software (Molecular Devices Corporation, Sunnyvale, Calif.). The background was defined as the RFU generated from wells that were not coated with HSP90 but were treated with the biotin-GM and streptavidin-PE. The background measurements were substrated from each sample treated with biotin-GM and streptavidin-PE measurements before other computation. Percent inhibition of binding for each sample was calculated from the background subtracted values as follows: % binding inhibition=[RFU untreated−RFU treated]/RFU untreated]×100.

Example B Cell Lysate Binding Assay

MCF7 breast carcinoma cell lysates were prepared by douncing in lysing buffer (20 mM HEPES, pH 7.3, 1 mM EDTA, 5 mM MgCl₂, 100 mM KCl), and then incubated with or without test compound for 30 mins at 4° C., followed by incubation with biotin-GM linked to BioMag™ streptavidin magnetic beads (Qiagen) for 1 hr at 4° C. The tubes were placed on a magnetic rack, and the unbound supernatant removed. The magnetic beads were washed three times in lysis buffer and boiled for 5 mins at 95° C. in SDS-PAGE sample buffer. Samples were analyzed on SDS protein gels, and Western blots done for rHSP90. Bands in the Western Blots were quantitated using the Bio-rad Fluor-S MultiImager, and the % inhibition of binding of rHSP90 to the biotin-GM was calculated.

The lysate binding ability of selected compounds of the invention based on the above assay is summarized in Table 2. The IC₅₀ reported is the concentration of test compound needed to achieve 50% inhibition of the biotin-GM binding to rHSP90 in the MCF7 cell lysates.

Example C HER2 Degradation Assay

MCF7 breast carcinoma cells (ATCC) were grown in Dulbecco's modified Eagle's medium (DMEM) containing 10% fetal bovine serum (FBS) and 10 mM HEPES, and plated in 24 well plates (50% confluent). Twenty-four hrs later (cells are 65–70% confluent), test compounds were added and incubated overnight for 16 h. For the less potent compounds, the amounts added were 100 μM, 30 μM, 10 μM and 1 μM, and for more potent compounds, the amounts added were 1 μM, 0.3 μM, 0.1 μM, 0.03 μM, 0.01 μM and 0.003 μM. The wells were washed with 1 mL phosphate buffered saline (PBS), and 200 μL trypsin was added to each well. After trypsinization was complete, 50 μL of FBS was added to each well. Then 200 μL cells was transferred to 96 well plates. The cells were pipetted up and down to obtain a single cell suspension. The plates were centrifuged at 2,500 rpm for 1 min using a Sorvall Legend RT™ tabletop centrifuge (Kendro Laboratory Products, Asheville, N.C.). The cells were then washed once in PBS containing 0.2% BSA and 0.2% sodium azide (BA buffer). Phycoerythrin (PE), conjugated anti HER2/Neu antibody (Becton Dickinson, #340552), or PE conjugated anti-keyhole limpet hemacyanin [KLH] (Becton Dickinson, #340761) control antibody was added at a dilution of 1:20 and 1:40 respectively (final concentration was 1 μg/mL) and the cells were pipeted up and down to form a single cell suspension, and incubated for 15 mins. The cells were washed twice with 200 μL BA buffer, and resuspended in 200 μL BA buffer, and transferred to FACSCAN tubes with an additional 250 μL BA buffer. Samples were analyzed using a FACSCalibur™ flow cytometer (Becton Dickinson, San Jose, Calif.) equipped with Argon-ion laser that emits 15 mW of 488 nm light for excitation of the PE fluorochrome. 10,000 events were collected per sample. A fluorescence histogram was generated and the mean fluorescence intensity (MFI) of each sample was determined using Cellquest software. The background was defined as the MFI generated from cells incubated with control IgG-PE, and was subtracted from each sample stained with the HER2/Neu antibody. Cells incubated with DMSO was always done as untreated controls since the compounds were resuspended in DMSO. Percent degradation of HER2 was calculated as follows: % HER2 degraded=[(MFI untreated cells−MFI treated cells)/MFI untreated cell]×100

The HER2 degradation ability of selected compounds of the invention based on this assay is summarized in Table 2. IC₅₀ is defined as the concentration at which there was 50% degradation of the HER2/Neu protein.

Example D MTS Assay

MTS assays measures the cytotoxicity of geldanamycin derivatives. MTS (3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium is a tetrazolium dye that is converted to a formazan product by dehydrogenase enzymes of metabolically active cells (Corey, A. et al. “Use of an aqueous soluble tetrazolium/formazan assay for cell growth assays in culture,” Cancer Commun. 1991, 3, 207–212). Cells were seeded in 96 well plates at 2000 cells/well and allowed to adhere overnight in Dulbecco's modified Eagle's medium supplemented with 10% fetal bovine serum. The final culture volume was 100 μl. Viable cell number was determined by using the Celltiter 96 AQ_(ueous) Non-radioactive Cell Proliferation Assay (Promega, Madison Wis.). The MTS/PMS (phenazine methosulfate) solution was mixed at a ratio of 20:1, and 20 μL was added per well to 100 μl of culture medium. After 2–4 hours, the formation of the formazan product was measured at 490 nm absorbance using a multiwell plate spectrophotometer. Background was determined by measuring the Abs 490 nm of cell culture medium and MTS-PMS in the absence of cells and was subtracted from all values. Percent viable cells was calculated as follows: % viable cells=(Abs at 490 nm treated cells/Abs at 490 nm untreated cells)×100

The effect of selected compounds of the invention on MCF7 breast carcinoma cells according to the MTS assay is summarized in Table 2. IC₅₀ was defined as the concentration of the compound which gave rise to 50% viable cell number.

TABLE 2 Biological Activities of Selected Compounds of Formula II, where R² = NH₂, R₃ = H II

Recombinant Binding assay Lysate binding HER2 IC₅₀ MTS IC₅₀ S. No Ex. # R⁵ R¹ (μM) (μM) (μM) l(μM) 1 51

Cl 0.7 0.025 0.055 0.2 2 98

Cl 0.7 0.03  0.025 0.1 3 102

Br 0.9 0.022 0.055 0.1 4 77

Br ND ND 0.10 0.3 5 44

Cl ND ND 0.08 2.0 6 25

Cl 0.9 0.021 0.030 0.2 7 31

Cl 0.8 0.030 0.060 5.0 8 21

Br 0.7 0.030 0.045 0.3 9 41

Cl ND ND 0.035 0.2 10 33

Cl ND ND 0.09 0.5 11 18

Cl ND ND 0.055 0.1 12 1

Cl ND ND 0.015  0.02 13 4

Cl ND ND 0.020  0.13 14 24

Br ND ND 0.060 0.4 15 19

Cl ND ND 0.080 0.4 16 5

Br ND 0.008 0.014  0.02 17 6

Br ND ND 0.060  0.05 18 111

Cl ND 0.003 0.009  0.02 19 115

Cl ND ND 0.060 ND ND = not determined

The foregoing examples are not limiting and are merely illustrative of various aspects and embodiments of the present invention. All documents cited herein are indicative of the levels of skill in the art to which the invention pertains and are incorporated by reference herein in their entireties. None, however, is admitted to be prior art.

One skilled in the art will readily appreciate that the present invention is well adapted to carry out the objects and obtain the ends and advantages mentioned, as well as those inherent therein. The methods and compositions described illustrate preferred embodiments, are exemplary, and are not intended as limitations on the scope of the invention. Certain modifications and other uses will occur to those skilled in the art, and are encompassed within the spirit of the invention, as defined by the scope of the claims.

The invention illustratively described herein suitably may be practiced in the absence of any element or elements, limitation or limitations which is not specifically disclosed herein. The terms and expressions which have been employed are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described, or portions thereof. It is recognized that various modifications are possible within the scope of the invention claimed. Thus, it should be understood that although the present invention has been specifically disclosed by preferred embodiments, optional features, modifications and variations of the concepts herein disclosed may be resorted to by those skilled in the art, and that such modifications and variations are considered to be within the scope of this invention as defined by the description and the appended claims.

In addition, where features or aspects of the invention are described in terms of Markush groups or other grouping of alternatives, e.g., genuses, those skilled in the art will recognize that the invention is also thereby described in terms of any individual member or subgroup of members of the Markush group or subgenus, and exclusions of individual members as appropriate, e.g., by proviso.

Other embodiments are within the following claims. 

1. A compound represented by Formula II, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:

wherein: R¹ is halogen; R² is —NH₂; R³ is hydrogen; R⁵ is a phenyl having 3 to 5 substituents, a pyridyl having 3 to 5 substituents or an 1-oxy-pyridyl (N-oxy-pyridyl) having 3 to 5 substituents in which at least one of the substituents is methoxy, and in which at least one of the substituents at the 3 and 5 positions are methoxy or methyl; provided that when R⁵ is aryl, R⁵ is not an organo-metallic cyclopentadiene; when R⁵ is phenyl, the substituents are not 3,5 di-halo; when R⁵ is alicycic, the ring system does not contain any tetra-substituted ring carbons; when R⁵ is heterocyclic, the ring system does not contain any tetra-substituted ring carbons or the ring system is not a tetra-substituted pyrrolidine.
 2. The compound of claim 1, or a polymorph, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, wherein R¹ is chloro or bromo, and R⁵ is a phenyl having 3 to 5 substituents.
 3. The compound of claim 1, or a polymorph, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, wherein R¹ is chloro or bromo, and R⁵ is a pyridyl having 3 to 5 substituents.
 4. The compound of claim 1, or a polymorph, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof, wherein R¹ is chloro or bromo, and R⁵ is an 1-oxy-pyridyl (N-oxy-pyridyl) having 3 to 5 substituents.
 5. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


6. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


7. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


8. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


9. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


10. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


11. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


12. The compound of claim 1, wherein the compound is a member selected from the group of compounds below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


13. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


14. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


15. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


16. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


17. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


18. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


19. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


20. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


21. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


22. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


23. The compound of claim 1, wherein said conmound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


24. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


25. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


26. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


27. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


28. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


29. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


30. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


31. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


32. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


33. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


34. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


35. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


36. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


37. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


38. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


39. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


40. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


41. The compound of claim 1, wherein said compound is represented by the formula below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


42. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


43. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


44. The compound of claim 1, wherein said compound is a member selected from the group below, or a polymorph, tautomer, pharmaceutically acceptable salt or prodrug thereof:


45. A pharmaceutical composition comprising one or more pharmaceutical acceptable excipients and at least one compound represented by Formula I below, or a polymorph, ester, tautomer, pharmaceutically acceptable salt or prodrug thereof:

wherein: R¹ is halogen; R² is —NH₂; R³ is hydrogen; R⁴ is —CH₂—; R⁵ is a phenyl having 3 to 5 substituents, a pyridyl having 3 to 5 substituents or an 1-oxy-pyridyl (N-oxy-pyridyl) having 3 to 5 substituents.
 46. The pharmaceutical composition of claim 45, wherein R¹ is chloro or bromo. 